<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/CommitmentsAndContingencies" xlink:href="tndm-20190630.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/CommitmentsAndContingenciesAdditionalInformationDetail" xlink:href="tndm-20190630.xsd#CommitmentsAndContingenciesAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/CondensedConsolidatedBalanceSheets" xlink:href="tndm-20190630.xsd#CondensedConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:href="tndm-20190630.xsd#CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:href="tndm-20190630.xsd#CondensedConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" xlink:href="tndm-20190630.xsd#CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/CondensedConsolidatedStatementsOfStockholdersEquityDeficit" xlink:href="tndm-20190630.xsd#CondensedConsolidatedStatementsOfStockholdersEquityDeficit" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/CoverPage" xlink:href="tndm-20190630.xsd#CoverPage" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/FairValueMeasurements" xlink:href="tndm-20190630.xsd#FairValueMeasurements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/FairValueMeasurementsAdditionalInformationDetail" xlink:href="tndm-20190630.xsd#FairValueMeasurementsAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/FairValueMeasurementsScheduleOfAssumptionsUsedToEstimateFairValuesOfCommonStockWarrantsDetail" xlink:href="tndm-20190630.xsd#FairValueMeasurementsScheduleOfAssumptionsUsedToEstimateFairValuesOfCommonStockWarrantsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/FairValueMeasurementsScheduleOfFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail" xlink:href="tndm-20190630.xsd#FairValueMeasurementsScheduleOfFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/FairValueMeasurementsScheduleOfFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisFootnoteDetail" xlink:href="tndm-20190630.xsd#FairValueMeasurementsScheduleOfFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisFootnoteDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/FairValueMeasurementsSummaryOfChangesInFairValueOfTotalLevel3FinancialAssetsDetail" xlink:href="tndm-20190630.xsd#FairValueMeasurementsSummaryOfChangesInFairValueOfTotalLevel3FinancialAssetsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/FairValueMeasurementsTables" xlink:href="tndm-20190630.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/Inventories" xlink:href="tndm-20190630.xsd#Inventories" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/InventoriesSummaryOfInventoriesDetail" xlink:href="tndm-20190630.xsd#InventoriesSummaryOfInventoriesDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/InventoriesTables" xlink:href="tndm-20190630.xsd#InventoriesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/Leases" xlink:href="tndm-20190630.xsd#Leases" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/LeasesAdditionalInformationDetail" xlink:href="tndm-20190630.xsd#LeasesAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/LeasesLeasesTables" xlink:href="tndm-20190630.xsd#LeasesLeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/LeasesScheduleOfFutureMinimumPaymentsUnderNonCancellableOperatingLeasesDetails" xlink:href="tndm-20190630.xsd#LeasesScheduleOfFutureMinimumPaymentsUnderNonCancellableOperatingLeasesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/OrganizationAndBasisOfPresentation" xlink:href="tndm-20190630.xsd#OrganizationAndBasisOfPresentation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/OrganizationAndBasisOfPresentationAdditionalInformationDetail" xlink:href="tndm-20190630.xsd#OrganizationAndBasisOfPresentationAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/OrganizationAndBasisOfPresentationPolicies" xlink:href="tndm-20190630.xsd#OrganizationAndBasisOfPresentationPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/ShortTermInvestments" xlink:href="tndm-20190630.xsd#ShortTermInvestments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/ShortTermInvestmentsSummaryOfEstimatedFairValueOfShortTermInvestmentsDetail" xlink:href="tndm-20190630.xsd#ShortTermInvestmentsSummaryOfEstimatedFairValueOfShortTermInvestmentsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/ShortTermInvestmentsTables" xlink:href="tndm-20190630.xsd#ShortTermInvestmentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/StockholdersEquity" xlink:href="tndm-20190630.xsd#StockholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/StockholdersEquityAdditionalInformationDetail" xlink:href="tndm-20190630.xsd#StockholdersEquityAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/StockholdersEquityScheduleOfAssumptionsUsedInBlackScholesOptionPricingModelDetail" xlink:href="tndm-20190630.xsd#StockholdersEquityScheduleOfAssumptionsUsedInBlackScholesOptionPricingModelDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/StockholdersEquityScheduleOfSharesOfCommonStockReservedForFutureIssuanceDetail" xlink:href="tndm-20190630.xsd#StockholdersEquityScheduleOfSharesOfCommonStockReservedForFutureIssuanceDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/StockholdersEquitySummaryForAllocationOfStockBasedCompensationExpenseDetail" xlink:href="tndm-20190630.xsd#StockholdersEquitySummaryForAllocationOfStockBasedCompensationExpenseDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/StockholdersEquityTables" xlink:href="tndm-20190630.xsd#StockholdersEquityTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="tndm-20190630.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail" xlink:href="tndm-20190630.xsd#SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail1" xlink:href="tndm-20190630.xsd#SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail1" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfAntiDilutiveSecuritiesDetail" xlink:href="tndm-20190630.xsd#SummaryOfSignificantAccountingPoliciesScheduleOfAntiDilutiveSecuritiesDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfReconciliationOfChangeInProductWarrantyLiabilitiesDetail" xlink:href="tndm-20190630.xsd#SummaryOfSignificantAccountingPoliciesSummaryOfReconciliationOfChangeInProductWarrantyLiabilitiesDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:href="tndm-20190630.xsd#SummaryOfSignificantAccountingPoliciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/TermLoanAgreement" xlink:href="tndm-20190630.xsd#TermLoanAgreement" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tandemdiabetes.com/role/TermLoanAgreementAdditionalInformationDetail" xlink:href="tndm-20190630.xsd#TermLoanAgreementAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel" xlink:type="simple" />
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/CommitmentsAndContingencies" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_47B69EE70BB0391A461AE1662915FE04" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_05DC01B8AE737DDB6F8CE16629155088" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_47B69EE70BB0391A461AE1662915FE04" xlink:to="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_05DC01B8AE737DDB6F8CE16629155088" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/CommitmentsAndContingenciesAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_515E7015EB2404AA2BD6E1662989E29E" xlink:type="locator" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_NumberOfLegalProceedingsRegulatoryMattersOrOtherDisputesOrClaims" xlink:label="loc_tndm_NumberOfLegalProceedingsRegulatoryMattersOrOtherDisputesOrClaims_FABE956874CE62A87804E1662989F1E6" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_515E7015EB2404AA2BD6E1662989E29E" xlink:to="loc_tndm_NumberOfLegalProceedingsRegulatoryMattersOrOtherDisputesOrClaims_FABE956874CE62A87804E1662989F1E6" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_5C45DD52A1EA895C25072B8A4AF14ECB" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_7A5389CD48E2BFC31F032B8A4AF1808F" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_5C45DD52A1EA895C25072B8A4AF14ECB" xlink:to="loc_us-gaap_StatementTable_7A5389CD48E2BFC31F032B8A4AF1808F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_36B1D7FD16A2D24956C62B8A4AF204D9" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_7A5389CD48E2BFC31F032B8A4AF1808F" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_36B1D7FD16A2D24956C62B8A4AF204D9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_62099330D93BA432C6572B8A4AF2DCCD" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_36B1D7FD16A2D24956C62B8A4AF204D9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_62099330D93BA432C6572B8A4AF2DCCD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PatentsMember" xlink:label="loc_us-gaap_PatentsMember_1BB35869B0E622A949992B8A4AF279D1" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_62099330D93BA432C6572B8A4AF2DCCD" xlink:to="loc_us-gaap_PatentsMember_1BB35869B0E622A949992B8A4AF279D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_E33B9FE54327D168C6D92B8A4AF34155" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_7A5389CD48E2BFC31F032B8A4AF1808F" xlink:to="loc_us-gaap_StatementLineItems_E33B9FE54327D168C6D92B8A4AF34155" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_A747DEBD87651407ACD72B8A4AF37099" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_E33B9FE54327D168C6D92B8A4AF34155" xlink:to="loc_us-gaap_AssetsAbstract_A747DEBD87651407ACD72B8A4AF37099" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_7EAD9548FF7A464B18A82B8A4AF34B21" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_A747DEBD87651407ACD72B8A4AF37099" xlink:to="loc_us-gaap_AssetsCurrentAbstract_7EAD9548FF7A464B18A82B8A4AF34B21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_44ED9379E053AFB43D9A2B8A4AF35CA0" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_7EAD9548FF7A464B18A82B8A4AF34B21" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_44ED9379E053AFB43D9A2B8A4AF35CA0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="loc_us-gaap_ShortTermInvestments_AF8807E359333D43FCD42B8A4AF4B15F" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_7EAD9548FF7A464B18A82B8A4AF34B21" xlink:to="loc_us-gaap_ShortTermInvestments_AF8807E359333D43FCD42B8A4AF4B15F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_722F04F5926889EC9E802B8A4AF44E7C" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_7EAD9548FF7A464B18A82B8A4AF34B21" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_722F04F5926889EC9E802B8A4AF44E7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_05E78D4D7FBE22FD5F252B8A4AF4FCC8" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_7EAD9548FF7A464B18A82B8A4AF34B21" xlink:to="loc_us-gaap_InventoryNet_05E78D4D7FBE22FD5F252B8A4AF4FCC8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_EA006684DAEA78670FD72B8A4AF496F8" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_7EAD9548FF7A464B18A82B8A4AF34B21" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_EA006684DAEA78670FD72B8A4AF496F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_01B575FE3573E58715922B8A4AF5F3D2" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_7EAD9548FF7A464B18A82B8A4AF34B21" xlink:to="loc_us-gaap_AssetsCurrent_01B575FE3573E58715922B8A4AF5F3D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_2453099DE1171F6032922B8A4AF5C7E2" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_A747DEBD87651407ACD72B8A4AF37099" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_2453099DE1171F6032922B8A4AF5C7E2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_9790786287C5DCAE89A32B8A4AF5807B" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_A747DEBD87651407ACD72B8A4AF37099" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_9790786287C5DCAE89A32B8A4AF5807B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_9946D2D5BA73EBA2C9BB2B8A4AF54766" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_A747DEBD87651407ACD72B8A4AF37099" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_9946D2D5BA73EBA2C9BB2B8A4AF54766" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_12F3C3BD2C9E3F7B8CAE2B8A4AF50328" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_A747DEBD87651407ACD72B8A4AF37099" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_12F3C3BD2C9E3F7B8CAE2B8A4AF50328" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_343F151580BC62F68B952B8A4AF581F1" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_A747DEBD87651407ACD72B8A4AF37099" xlink:to="loc_us-gaap_Assets_343F151580BC62F68B952B8A4AF581F1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_E33B9FE54327D168C6D92B8A4AF34155" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_B56C8472FCF8BEDE7BFC2B8A4AF647D1" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_B56C8472FCF8BEDE7BFC2B8A4AF647D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_738DE94C6AB1C5F5BE6D2B8A4AF6C7B8" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_B56C8472FCF8BEDE7BFC2B8A4AF647D1" xlink:to="loc_us-gaap_AccountsPayableCurrent_738DE94C6AB1C5F5BE6D2B8A4AF6C7B8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_6E41949782A4F86A77B82B8A4AF6937D" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_B56C8472FCF8BEDE7BFC2B8A4AF647D1" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_6E41949782A4F86A77B82B8A4AF6937D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_D0EAF62790F76B15C6BF2B8A4AF71BD5" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_B56C8472FCF8BEDE7BFC2B8A4AF647D1" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_D0EAF62790F76B15C6BF2B8A4AF71BD5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_5EB080C7A6E7A08BEB882B8A4AF75210" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_B56C8472FCF8BEDE7BFC2B8A4AF647D1" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_5EB080C7A6E7A08BEB882B8A4AF75210" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_F188F145D90BFE6924882B8A4AF7D991" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_B56C8472FCF8BEDE7BFC2B8A4AF647D1" xlink:to="loc_us-gaap_DeferredRevenueCurrent_F188F145D90BFE6924882B8A4AF7D991" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_CommonStockWarrants" xlink:label="loc_tndm_CommonStockWarrants_DF7308EC69AB46AB3C5D2B8A4AF7EFF8" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_B56C8472FCF8BEDE7BFC2B8A4AF647D1" xlink:to="loc_tndm_CommonStockWarrants_DF7308EC69AB46AB3C5D2B8A4AF7EFF8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_0BC9F6D77D759ED758172B8A4AF82EC2" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_B56C8472FCF8BEDE7BFC2B8A4AF647D1" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_0BC9F6D77D759ED758172B8A4AF82EC2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_600B0765E4CFB3E1FC732B8A4AF88C1A" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_B56C8472FCF8BEDE7BFC2B8A4AF647D1" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_600B0765E4CFB3E1FC732B8A4AF88C1A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_4A27A1393745359CD2642B8A4AF8966D" xlink:type="locator" />
    <link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_B56C8472FCF8BEDE7BFC2B8A4AF647D1" xlink:to="loc_us-gaap_LiabilitiesCurrent_4A27A1393745359CD2642B8A4AF8966D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredRentCreditNoncurrent" xlink:label="loc_us-gaap_DeferredRentCreditNoncurrent_F4D90B2B06C67B6F935B2B8A4AF861F8" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:to="loc_us-gaap_DeferredRentCreditNoncurrent_F4D90B2B06C67B6F935B2B8A4AF861F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_3672C83CAC4688515DB72B8A4AF8120F" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_3672C83CAC4688515DB72B8A4AF8120F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_E57E39EBA05F0559E3002B8A4AF8E5DE" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_E57E39EBA05F0559E3002B8A4AF8E5DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_287B9A1195B321C018022B8A4AF90E1C" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:to="loc_us-gaap_Liabilities_287B9A1195B321C018022B8A4AF90E1C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_A89698A020E6F85A29152B8A4AF9665A" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:to="loc_us-gaap_CommitmentsAndContingencies_A89698A020E6F85A29152B8A4AF9665A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_8DC40242DB7028EB0A1B2B8A4AF9D0C3" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:to="loc_us-gaap_StockholdersEquityAbstract_8DC40242DB7028EB0A1B2B8A4AF9D0C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_A91BA666A2BBCDF78AF32B8A4AF958CE" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:to="loc_us-gaap_CommonStockValue_A91BA666A2BBCDF78AF32B8A4AF958CE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_4047F830282ACF6ED2262B8A4AF945D3" xlink:type="locator" />
    <link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_4047F830282ACF6ED2262B8A4AF945D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_327B7A4BFA53A007583C2B8A4AFA1061" xlink:type="locator" />
    <link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_327B7A4BFA53A007583C2B8A4AFA1061" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_5B58B2C3E53785288E4F2B8A4AFAF22C" xlink:type="locator" />
    <link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_5B58B2C3E53785288E4F2B8A4AFAF22C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_169C34C888D3C290FB8C2B8A4AFA618A" xlink:type="locator" />
    <link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:to="loc_us-gaap_StockholdersEquity_169C34C888D3C290FB8C2B8A4AFA618A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_D38595A31D35FD45126F2B8A4AFF4A02" xlink:type="locator" />
    <link:presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_AF1DE603E1D1AB9F742D2B8A4AF6250B" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_D38595A31D35FD45126F2B8A4AFF4A02" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_35ECF69D736F0EF51A2AE16629A14D30" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_705FD97E982CB0BD960BE16629A1A866" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_35ECF69D736F0EF51A2AE16629A14D30" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_705FD97E982CB0BD960BE16629A1A866" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_B2EBF11E2D9CE5B205F8E16629A5246C" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_35ECF69D736F0EF51A2AE16629A14D30" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_B2EBF11E2D9CE5B205F8E16629A5246C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_D0F88F7B9E7958F0BE6CE16629A525B0" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_35ECF69D736F0EF51A2AE16629A14D30" xlink:to="loc_us-gaap_CommonStockSharesIssued_D0F88F7B9E7958F0BE6CE16629A525B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_553FA707508C9DB4814BE16629A5DAFE" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_35ECF69D736F0EF51A2AE16629A14D30" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_553FA707508C9DB4814BE16629A5DAFE" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_6E02872D71D8CA7C9AB44AA05DEE9E88" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_77B435B78933AE8C15F44AA05DF40CD1" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_6E02872D71D8CA7C9AB44AA05DEE9E88" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_77B435B78933AE8C15F44AA05DF40CD1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_ACD88A32F096A995DD624AA05DFAAAAD" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_77B435B78933AE8C15F44AA05DF40CD1" xlink:to="loc_us-gaap_ProfitLoss_ACD88A32F096A995DD624AA05DFAAAAD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5777D6F1280FFA7587E14AA05DFBA0B0" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_77B435B78933AE8C15F44AA05DF40CD1" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5777D6F1280FFA7587E14AA05DFBA0B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_CEDBA4B941CC5BBDA4424AA05DFB415C" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5777D6F1280FFA7587E14AA05DFBA0B0" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_CEDBA4B941CC5BBDA4424AA05DFB415C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_B2970A636DD751A6D7804AA05DFB8B0D" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5777D6F1280FFA7587E14AA05DFBA0B0" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_B2970A636DD751A6D7804AA05DFB8B0D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_23846BB2E1F6EC373D6A4AA05DFCC271" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5777D6F1280FFA7587E14AA05DFBA0B0" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_23846BB2E1F6EC373D6A4AA05DFCC271" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryWriteDown" xlink:label="loc_us-gaap_InventoryWriteDown_C891D1F0500A9FE5B17B4AA05DFCB9CF" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5777D6F1280FFA7587E14AA05DFBA0B0" xlink:to="loc_us-gaap_InventoryWriteDown_C891D1F0500A9FE5B17B4AA05DFCB9CF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAdjustmentOfWarrants" xlink:label="loc_us-gaap_FairValueAdjustmentOfWarrants_A4164B7AD800055D83E34AA05DFC2F12" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5777D6F1280FFA7587E14AA05DFBA0B0" xlink:to="loc_us-gaap_FairValueAdjustmentOfWarrants_A4164B7AD800055D83E34AA05DFC2F12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium" xlink:label="loc_us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium_EBDD21AAF57B72AA31504AA05DFD523A" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5777D6F1280FFA7587E14AA05DFBA0B0" xlink:to="loc_us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium_EBDD21AAF57B72AA31504AA05DFD523A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_3ADBD0BCF364DF162D954AA05DFD2FF6" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5777D6F1280FFA7587E14AA05DFBA0B0" xlink:to="loc_us-gaap_ShareBasedCompensation_3ADBD0BCF364DF162D954AA05DFD2FF6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherOperatingActivitiesCashFlowStatement" xlink:label="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_92796B0DEEF5961A8EE24AA05DFDE63F" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5777D6F1280FFA7587E14AA05DFBA0B0" xlink:to="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_92796B0DEEF5961A8EE24AA05DFDE63F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_DD97053509A1F7CBC1674AA05DFD23D8" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_77B435B78933AE8C15F44AA05DF40CD1" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_DD97053509A1F7CBC1674AA05DFD23D8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_99B73158EA31A7A1F2864AA05DFE28A1" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_DD97053509A1F7CBC1674AA05DFD23D8" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_99B73158EA31A7A1F2864AA05DFE28A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_DA36B3D6329D4FC94E464AA05DFEE835" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_DD97053509A1F7CBC1674AA05DFD23D8" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_DA36B3D6329D4FC94E464AA05DFEE835" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_C4C6C18E313DC4A55A4F4AA05DFF8633" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_DD97053509A1F7CBC1674AA05DFD23D8" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_C4C6C18E313DC4A55A4F4AA05DFF8633" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_3A29FE1768F2B1699DA64AA05DFFBB35" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_DD97053509A1F7CBC1674AA05DFD23D8" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_3A29FE1768F2B1699DA64AA05DFFBB35" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_63BD94FCA5A20E173F124AA05DFFB5CB" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_DD97053509A1F7CBC1674AA05DFD23D8" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_63BD94FCA5A20E173F124AA05DFFB5CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_B97D7EA2FBBCD557096E4AA05DFFAD6D" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_DD97053509A1F7CBC1674AA05DFD23D8" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_B97D7EA2FBBCD557096E4AA05DFFAD6D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_08F8218A5D166BC39E324AA05E0062FA" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_DD97053509A1F7CBC1674AA05DFD23D8" xlink:to="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_08F8218A5D166BC39E324AA05E0062FA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_CCDA4B18BED52E5889BB4AA05E00E0BE" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_DD97053509A1F7CBC1674AA05DFD23D8" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_CCDA4B18BED52E5889BB4AA05E00E0BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInOtherCurrentLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_54443DB928BFFA36C6544AA05E00DBA1" xlink:type="locator" />
    <link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_DD97053509A1F7CBC1674AA05DFD23D8" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_54443DB928BFFA36C6544AA05E00DBA1" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_IncreaseDecreaseInDeferredRent" xlink:label="loc_tndm_IncreaseDecreaseInDeferredRent_42EFD921E1944BA392814AA05E013129" xlink:type="locator" />
    <link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_DD97053509A1F7CBC1674AA05DFD23D8" xlink:to="loc_tndm_IncreaseDecreaseInDeferredRent_42EFD921E1944BA392814AA05E013129" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_48049D7B8528390AF8CA4AA05E014A1C" xlink:type="locator" />
    <link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_DD97053509A1F7CBC1674AA05DFD23D8" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_48049D7B8528390AF8CA4AA05E014A1C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_5A99649BB545DB108A9E4AA05E0155C1" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_77B435B78933AE8C15F44AA05DF40CD1" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_5A99649BB545DB108A9E4AA05E0155C1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_2784B2D14EAFB353D78F4AA05E016F51" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_6E02872D71D8CA7C9AB44AA05DEE9E88" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_2784B2D14EAFB353D78F4AA05E016F51" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireShortTermInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_B43CA92620A2087E3A234AA05E01734E" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_2784B2D14EAFB353D78F4AA05E016F51" xlink:to="loc_us-gaap_PaymentsToAcquireShortTermInvestments_B43CA92620A2087E3A234AA05E01734E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments" xlink:label="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments_27A8178F9576CE4BA4DF4AA05E02E2E3" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_2784B2D14EAFB353D78F4AA05E016F51" xlink:to="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments_27A8178F9576CE4BA4DF4AA05E02E2E3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_ECBB4265C7520210BEAF4AA05E02E61B" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_2784B2D14EAFB353D78F4AA05E016F51" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_ECBB4265C7520210BEAF4AA05E02E61B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_05A3B803C3017A1D70714AA05E03B7D0" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_2784B2D14EAFB353D78F4AA05E016F51" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_05A3B803C3017A1D70714AA05E03B7D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_150ECF13DF9922BD8C404AA05E032475" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_6E02872D71D8CA7C9AB44AA05DEE9E88" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_150ECF13DF9922BD8C404AA05E032475" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_ProceedsFromPublicOfferingNetOfOfferingCosts" xlink:label="loc_tndm_ProceedsFromPublicOfferingNetOfOfferingCosts_E95CA8674E30126D4D544AA05E032CD5" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_150ECF13DF9922BD8C404AA05E032475" xlink:to="loc_tndm_ProceedsFromPublicOfferingNetOfOfferingCosts_E95CA8674E30126D4D544AA05E032CD5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromWarrantExercises" xlink:label="loc_us-gaap_ProceedsFromWarrantExercises_2E9C66C48479A9BAF9984AA05E03B915" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_150ECF13DF9922BD8C404AA05E032475" xlink:to="loc_us-gaap_ProceedsFromWarrantExercises_2E9C66C48479A9BAF9984AA05E03B915" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_1FCD7A7BF79E32FE60534AA05E043967" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_150ECF13DF9922BD8C404AA05E032475" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_1FCD7A7BF79E32FE60534AA05E043967" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_A737BA5EC826D713AB014AA05E0468C5" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_150ECF13DF9922BD8C404AA05E032475" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_A737BA5EC826D713AB014AA05E0468C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_F0D0D03108DB9ED8CCFF4AA05E0458C7" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_6E02872D71D8CA7C9AB44AA05DEE9E88" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_F0D0D03108DB9ED8CCFF4AA05E0458C7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_48F58428376C1E357B824AA05E05CD26" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_6E02872D71D8CA7C9AB44AA05DEE9E88" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_48F58428376C1E357B824AA05E05CD26" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_992D11FE3D24A4227E7C4AA05E05C2A8" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_6E02872D71D8CA7C9AB44AA05DEE9E88" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_992D11FE3D24A4227E7C4AA05E05C2A8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_ECA5AC9030110983592C4AA05E05C7B2" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_6E02872D71D8CA7C9AB44AA05DEE9E88" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_ECA5AC9030110983592C4AA05E05C7B2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_BABA0A89012CC74EDB0A4AA05E05ED34" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_6E02872D71D8CA7C9AB44AA05DEE9E88" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_BABA0A89012CC74EDB0A4AA05E05ED34" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestPaidNet" xlink:label="loc_us-gaap_InterestPaidNet_BDEB39E1C0DB85769A784AA05E062492" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_BABA0A89012CC74EDB0A4AA05E05ED34" xlink:to="loc_us-gaap_InterestPaidNet_BDEB39E1C0DB85769A784AA05E062492" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NoncashInvestingAndFinancingItemsAbstract" xlink:label="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_D0F4230F5371E6FB25054AA05E062BE6" xlink:type="locator" />
    <link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_6E02872D71D8CA7C9AB44AA05DEE9E88" xlink:to="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_D0F4230F5371E6FB25054AA05E062BE6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_386410462DB3CF803F814AA05E064A23" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_D0F4230F5371E6FB25054AA05E062BE6" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_386410462DB3CF803F814AA05E064A23" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_DebtDiscountIncurredDuringNoncashOrPartialNoncashTransaction" xlink:label="loc_tndm_DebtDiscountIncurredDuringNoncashOrPartialNoncashTransaction_D81F5F4B7735FFF6C7A24AA05E0795CC" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_D0F4230F5371E6FB25054AA05E062BE6" xlink:to="loc_tndm_DebtDiscountIncurredDuringNoncashOrPartialNoncashTransaction_D81F5F4B7735FFF6C7A24AA05E0795CC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_CC30DF2D4AEEC07896A74AA05E078858" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_D0F4230F5371E6FB25054AA05E062BE6" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_CC30DF2D4AEEC07896A74AA05E078858" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_F3503D768F37F47F5C462AED9DAED8B7" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_9E65E199BF547DFF3EF92AED9DAE5769" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_F3503D768F37F47F5C462AED9DAED8B7" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_9E65E199BF547DFF3EF92AED9DAE5769" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_91405B9F95B64B02758A2AED9DAE4649" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_F3503D768F37F47F5C462AED9DAED8B7" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_91405B9F95B64B02758A2AED9DAE4649" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_B6C8963E8AA1C180C5432AED9DAF6FE1" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_F3503D768F37F47F5C462AED9DAED8B7" xlink:to="loc_us-gaap_GrossProfit_B6C8963E8AA1C180C5432AED9DAF6FE1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_5030FE388C4DB374C6232AED9DAFDC53" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_F3503D768F37F47F5C462AED9DAED8B7" xlink:to="loc_us-gaap_OperatingExpensesAbstract_5030FE388C4DB374C6232AED9DAFDC53" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_F135CFDE390EF1E9768E2AED9DAFBD86" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingExpensesAbstract_5030FE388C4DB374C6232AED9DAFDC53" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_F135CFDE390EF1E9768E2AED9DAFBD86" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_7108B67CE3634DC08DA52AED9DAFE5A8" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingExpensesAbstract_5030FE388C4DB374C6232AED9DAFDC53" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_7108B67CE3634DC08DA52AED9DAFE5A8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_02CC6F305AD75518E8AA2AED9DAFB4F1" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingExpensesAbstract_5030FE388C4DB374C6232AED9DAFDC53" xlink:to="loc_us-gaap_OperatingExpenses_02CC6F305AD75518E8AA2AED9DAFB4F1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_ED490337DD85EF6E09382AED9DB01F63" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_F3503D768F37F47F5C462AED9DAED8B7" xlink:to="loc_us-gaap_OperatingIncomeLoss_ED490337DD85EF6E09382AED9DB01F63" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpenseAbstract" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_FCC08E1D187CF71BF2132AED9DB05ECD" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_F3503D768F37F47F5C462AED9DAED8B7" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_FCC08E1D187CF71BF2132AED9DB05ECD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestAndOtherIncome" xlink:label="loc_us-gaap_InterestAndOtherIncome_52D3EE0A03BD98659B3E2AED9DB07247" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_FCC08E1D187CF71BF2132AED9DB05ECD" xlink:to="loc_us-gaap_InterestAndOtherIncome_52D3EE0A03BD98659B3E2AED9DB07247" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestExpenseOther" xlink:label="loc_us-gaap_InterestExpenseOther_5163591014EC5273D1762AED9DB0995D" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_FCC08E1D187CF71BF2132AED9DB05ECD" xlink:to="loc_us-gaap_InterestExpenseOther_5163591014EC5273D1762AED9DB0995D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAdjustmentOfWarrants" xlink:label="loc_us-gaap_FairValueAdjustmentOfWarrants_0AC8E991478742C462342AED9DB0E8B7" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_FCC08E1D187CF71BF2132AED9DB05ECD" xlink:to="loc_us-gaap_FairValueAdjustmentOfWarrants_0AC8E991478742C462342AED9DB0E8B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_192A5F39A0AF95B147A12AED9DB13755" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_FCC08E1D187CF71BF2132AED9DB05ECD" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_192A5F39A0AF95B147A12AED9DB13755" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_68FF90CE314D2E7C36F82AED9DB187A4" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_F3503D768F37F47F5C462AED9DAED8B7" xlink:to="loc_us-gaap_NetIncomeLoss_68FF90CE314D2E7C36F82AED9DB187A4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_DD23C71E44A1EBB48F4B2AED9DB1A722" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_F3503D768F37F47F5C462AED9DAED8B7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_DD23C71E44A1EBB48F4B2AED9DB1A722" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_2CB77E5F35EAFBBC63A72AED9DB1A070" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_DD23C71E44A1EBB48F4B2AED9DB1A722" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_2CB77E5F35EAFBBC63A72AED9DB1A070" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_470D5ACBEB26A4018F162AED9DB26CA2" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_DD23C71E44A1EBB48F4B2AED9DB1A722" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_470D5ACBEB26A4018F162AED9DB26CA2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_5592A8255B08553B4C092AED9DB280AA" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_DD23C71E44A1EBB48F4B2AED9DB1A722" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_5592A8255B08553B4C092AED9DB280AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDiluted_84767DE16F0AF070316C2AED9DB231AB" xlink:type="locator" />
    <link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_F3503D768F37F47F5C462AED9DAED8B7" xlink:to="loc_us-gaap_EarningsPerShareBasicAndDiluted_84767DE16F0AF070316C2AED9DB231AB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:label="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_229F6BFB1FD5B13165872AED9DB282B9" xlink:type="locator" />
    <link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_F3503D768F37F47F5C462AED9DAED8B7" xlink:to="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_229F6BFB1FD5B13165872AED9DB282B9" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/CondensedConsolidatedStatementsOfStockholdersEquityDeficit" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:label="loc_us-gaap_StatementOfStockholdersEquityAbstract_6035F951B7BB535C029E2AED9D9E77F7" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_48A7F580C4686F9611AD2AED9D9EC339" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfStockholdersEquityAbstract_6035F951B7BB535C029E2AED9D9E77F7" xlink:to="loc_us-gaap_StatementTable_48A7F580C4686F9611AD2AED9D9EC339" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_ED19E1858190AE73D5AF2AED9D9E9D90" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_48A7F580C4686F9611AD2AED9D9EC339" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_ED19E1858190AE73D5AF2AED9D9E9D90" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_05835B289130E78DB5FA2AED9D9EA75C" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ED19E1858190AE73D5AF2AED9D9E9D90" xlink:to="loc_us-gaap_EquityComponentDomain_05835B289130E78DB5FA2AED9D9EA75C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_4AA63F698D8ACB5E86622AED9D9F58B8" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_05835B289130E78DB5FA2AED9D9EA75C" xlink:to="loc_us-gaap_CommonStockMember_4AA63F698D8ACB5E86622AED9D9F58B8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_37360C6886CFA0A9495D2AED9D9FC632" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_05835B289130E78DB5FA2AED9D9EA75C" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_37360C6886CFA0A9495D2AED9D9FC632" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_4225A7488DA984FD9A4E2AED9D9FCA09" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_05835B289130E78DB5FA2AED9D9EA75C" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_4225A7488DA984FD9A4E2AED9D9FCA09" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_7AE263667B61ABAE85372AED9D9FFBBB" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_05835B289130E78DB5FA2AED9D9EA75C" xlink:to="loc_us-gaap_RetainedEarningsMember_7AE263667B61ABAE85372AED9D9FFBBB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_50D26500B7792560892F2AED9DA03BD6" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_48A7F580C4686F9611AD2AED9D9EC339" xlink:to="loc_us-gaap_StatementLineItems_50D26500B7792560892F2AED9DA03BD6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_50D26500B7792560892F2AED9DA03BD6" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_F9B0A70CE54A70CF77B52AED9DA0B1EC" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_StockholdersEquity_F9B0A70CE54A70CF77B52AED9DA0B1EC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="loc_us-gaap_SharesOutstanding_D7259393E46C1D35BAA52AED9DA04939" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_SharesOutstanding_D7259393E46C1D35BAA52AED9DA04939" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_33C95EBF3F33D488D5F82AED9DA14144" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_33C95EBF3F33D488D5F82AED9DA14144" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_96342F86B57B4ABCC9362AED9DA11F52" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_96342F86B57B4ABCC9362AED9DA11F52" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_StockIssuedDuringPeriodValueCommonStockWarrantsExercised" xlink:label="loc_tndm_StockIssuedDuringPeriodValueCommonStockWarrantsExercised_3FB7D545116E77F550C52AED9DA1519D" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_tndm_StockIssuedDuringPeriodValueCommonStockWarrantsExercised_3FB7D545116E77F550C52AED9DA1519D" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_StockIssuedDuringPeriodSharesCommonStockWarrantsExercised" xlink:label="loc_tndm_StockIssuedDuringPeriodSharesCommonStockWarrantsExercised_8DF565421D1378BA01CD2AED9DA22153" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_tndm_StockIssuedDuringPeriodSharesCommonStockWarrantsExercised_8DF565421D1378BA01CD2AED9DA22153" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_087E27556C8C5ADFC37E2AED9DA21495" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_087E27556C8C5ADFC37E2AED9DA21495" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_F0B4E63077FAF6FAEA602AED9DA24AED" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_F0B4E63077FAF6FAEA602AED9DA24AED" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_FairValueOfCommonStockWarrantsAtTimeOfExercise" xlink:label="loc_tndm_FairValueOfCommonStockWarrantsAtTimeOfExercise_DF8F14B81507F9C43CE92AED9DA24929" xlink:type="locator" />
    <link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_tndm_FairValueOfCommonStockWarrantsAtTimeOfExercise_DF8F14B81507F9C43CE92AED9DA24929" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_802E4A84CAA75B814EBD2AED9DA25509" xlink:type="locator" />
    <link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_802E4A84CAA75B814EBD2AED9DA25509" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_140A63D0E536CCEA16BB2AED9DA3975E" xlink:type="locator" />
    <link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_140A63D0E536CCEA16BB2AED9DA3975E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_A1783F4651EC867CA6802AED9DA351D3" xlink:type="locator" />
    <link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_A1783F4651EC867CA6802AED9DA351D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_6DADD9ED2CE0EB67C69F2AED9DA38681" xlink:type="locator" />
    <link:presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_NetIncomeLoss_6DADD9ED2CE0EB67C69F2AED9DA38681" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CumulativeEffectOnRetainedEarningsNetOfTax1" xlink:label="loc_us-gaap_CumulativeEffectOnRetainedEarningsNetOfTax1_5EB67C0BD34C43D2C96B2AED9DA18823" xlink:type="locator" />
    <link:presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_CumulativeEffectOnRetainedEarningsNetOfTax1_5EB67C0BD34C43D2C96B2AED9DA18823" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_IssuanceOfCommonStockInitialPublicOfferingNetOfUnderwritingDiscountsAndCommissions" xlink:label="loc_tndm_IssuanceOfCommonStockInitialPublicOfferingNetOfUnderwritingDiscountsAndCommissions_C3C4DFADF3F1C82148602AED9DA1B81C" xlink:type="locator" />
    <link:presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_tndm_IssuanceOfCommonStockInitialPublicOfferingNetOfUnderwritingDiscountsAndCommissions_C3C4DFADF3F1C82148602AED9DA1B81C" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_IssuanceOfCommonStockInitialPublicOfferingNetOfUnderwritingDiscountsAndCommissionsShares" xlink:label="loc_tndm_IssuanceOfCommonStockInitialPublicOfferingNetOfUnderwritingDiscountsAndCommissionsShares_85FF93E7CE7F1620D1D42AED9DA15CA6" xlink:type="locator" />
    <link:presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_tndm_IssuanceOfCommonStockInitialPublicOfferingNetOfUnderwritingDiscountsAndCommissionsShares_85FF93E7CE7F1620D1D42AED9DA15CA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_78BBEAACE6B3E5049D632AED9DA31B5D" xlink:type="locator" />
    <link:presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_78BBEAACE6B3E5049D632AED9DA31B5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_E02A4F818518640646342AED9DA3991D" xlink:type="locator" />
    <link:presentationArc order="18" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_StockholdersEquity_E02A4F818518640646342AED9DA3991D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="loc_us-gaap_SharesOutstanding_F61A60C372D39F1B067B2AED9DA3DF6E" xlink:type="locator" />
    <link:presentationArc order="19" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3285CBA1F99B35FD6F142AED9DA0BB29" xlink:to="loc_us-gaap_SharesOutstanding_F61A60C372D39F1B067B2AED9DA3DF6E" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CoverAbstract" xlink:label="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:type="locator" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_22CC6AD62BAFB48EC5EE4E642C8D6270" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_DocumentType_22CC6AD62BAFB48EC5EE4E642C8D6270" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentQuarterlyReport" xlink:label="loc_dei_DocumentQuarterlyReport_5516806DF4E26A1FA6C54E642C8D0CF2" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_DocumentQuarterlyReport_5516806DF4E26A1FA6C54E642C8D0CF2" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_021CE37A0987EE489B104E642C8D4917" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_DocumentPeriodEndDate_021CE37A0987EE489B104E642C8D4917" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentTransitionReport" xlink:label="loc_dei_DocumentTransitionReport_7D29586A4DB30BDBAB194E642C8D0947" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_DocumentTransitionReport_7D29586A4DB30BDBAB194E642C8D0947" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFileNumber" xlink:label="loc_dei_EntityFileNumber_2E807F32A21684F031DB4E642C8E23A6" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityFileNumber_2E807F32A21684F031DB4E642C8E23A6" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_298779679238407031EB4E642C911515" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityRegistrantName_298779679238407031EB4E642C911515" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="loc_dei_EntityIncorporationStateCountryCode_548952425DC95697E65C4E642C8E3C58" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityIncorporationStateCountryCode_548952425DC95697E65C4E642C8E3C58" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityTaxIdentificationNumber" xlink:label="loc_dei_EntityTaxIdentificationNumber_06082C0566A99D2FB1F84E642C8E4C7F" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityTaxIdentificationNumber_06082C0566A99D2FB1F84E642C8E4C7F" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine1" xlink:label="loc_dei_EntityAddressAddressLine1_9D73477DAC29802338BB4E642C8E7ACC" xlink:type="locator" />
    <link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityAddressAddressLine1_9D73477DAC29802338BB4E642C8E7ACC" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressPostalZipCode" xlink:label="loc_dei_EntityAddressPostalZipCode_9E3011055C283EF457A04E642C8E1F0E" xlink:type="locator" />
    <link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityAddressPostalZipCode_9E3011055C283EF457A04E642C8E1F0E" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCityOrTown" xlink:label="loc_dei_EntityAddressCityOrTown_0DC5B17B3983ACE5C0CD4E642C8E94CF" xlink:type="locator" />
    <link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityAddressCityOrTown_0DC5B17B3983ACE5C0CD4E642C8E94CF" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressStateOrProvince" xlink:label="loc_dei_EntityAddressStateOrProvince_D70B26D9B241267642414E642C8FCEE8" xlink:type="locator" />
    <link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityAddressStateOrProvince_D70B26D9B241267642414E642C8FCEE8" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CityAreaCode" xlink:label="loc_dei_CityAreaCode_C02C366B70CC5E09A3824E642C8FC0BB" xlink:type="locator" />
    <link:presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_CityAreaCode_C02C366B70CC5E09A3824E642C8FC0BB" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LocalPhoneNumber" xlink:label="loc_dei_LocalPhoneNumber_EEBB00B31D31569022854E642C8F1EC8" xlink:type="locator" />
    <link:presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_LocalPhoneNumber_EEBB00B31D31569022854E642C8F1EC8" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_Security12bTitle" xlink:label="loc_dei_Security12bTitle_E891133ED6A54F9047024E642C8F1867" xlink:type="locator" />
    <link:presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_Security12bTitle_E891133ED6A54F9047024E642C8F1867" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_TradingSymbol" xlink:label="loc_dei_TradingSymbol_D9124C9C67D6B7F870254E642C8F6646" xlink:type="locator" />
    <link:presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_TradingSymbol_D9124C9C67D6B7F870254E642C8F6646" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SecurityExchangeName" xlink:label="loc_dei_SecurityExchangeName_C4F6D8F2ED17B01F30E54E642C8F906F" xlink:type="locator" />
    <link:presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_SecurityExchangeName_C4F6D8F2ED17B01F30E54E642C8F906F" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_9E437847339FD34EEA3C4E642C90BB5B" xlink:type="locator" />
    <link:presentationArc order="18" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityCurrentReportingStatus_9E437847339FD34EEA3C4E642C90BB5B" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityInteractiveDataCurrent" xlink:label="loc_dei_EntityInteractiveDataCurrent_E8F5F8EFBE75E3238CE14E642C90E01F" xlink:type="locator" />
    <link:presentationArc order="19" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityInteractiveDataCurrent_E8F5F8EFBE75E3238CE14E642C90E01F" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_CF2D28C5C9275A230E284E642C904326" xlink:type="locator" />
    <link:presentationArc order="20" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityFilerCategory_CF2D28C5C9275A230E284E642C904326" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntitySmallBusiness" xlink:label="loc_dei_EntitySmallBusiness_E5B137C6A0E694F623EE4E642C90E7CE" xlink:type="locator" />
    <link:presentationArc order="21" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntitySmallBusiness_E5B137C6A0E694F623EE4E642C90E7CE" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="loc_dei_EntityEmergingGrowthCompany_D70992A402BB80AF30AD4E642C90A3F4" xlink:type="locator" />
    <link:presentationArc order="22" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityEmergingGrowthCompany_D70992A402BB80AF30AD4E642C90A3F4" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityShellCompany" xlink:label="loc_dei_EntityShellCompany_3F1A4FE26A4700041C1B4E642C90B297" xlink:type="locator" />
    <link:presentationArc order="23" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityShellCompany_3F1A4FE26A4700041C1B4E642C90B297" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_38D7E99CFBD5AF408E0E4E642C900658" xlink:type="locator" />
    <link:presentationArc order="24" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_38D7E99CFBD5AF408E0E4E642C900658" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_CF79364C7BA9CAEB91144E642C90CD13" xlink:type="locator" />
    <link:presentationArc order="25" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_AmendmentFlag_CF79364C7BA9CAEB91144E642C90CD13" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_33BC1B4503A59FF82C5B4E642C90AD17" xlink:type="locator" />
    <link:presentationArc order="26" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_DocumentFiscalYearFocus_33BC1B4503A59FF82C5B4E642C90AD17" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_C1EE64EB4F625DABC5814E642C91438E" xlink:type="locator" />
    <link:presentationArc order="27" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_DocumentFiscalPeriodFocus_C1EE64EB4F625DABC5814E642C91438E" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_D559C64F9E48C231D8F34E642C91CF28" xlink:type="locator" />
    <link:presentationArc order="28" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_EntityCentralIndexKey_D559C64F9E48C231D8F34E642C91CF28" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_EE79C6E25C471F9F92B34E642C919ED2" xlink:type="locator" />
    <link:presentationArc order="29" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_5A3FC8E4EC8773337E414E642C8C270B" xlink:to="loc_dei_CurrentFiscalYearEndDate_EE79C6E25C471F9F92B34E642C919ED2" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/FairValueMeasurements" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_4F0B17EF575A69998B28E16629CDC8A6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock" xlink:label="loc_us-gaap_FairValueDisclosuresTextBlock_961BFF315F7742FDD78EE16629CDDD04" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_4F0B17EF575A69998B28E16629CDC8A6" xlink:to="loc_us-gaap_FairValueDisclosuresTextBlock_961BFF315F7742FDD78EE16629CDDD04" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/FairValueMeasurementsAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_FFD2FDF187D1AF2B7402202DA15E0C34" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_463314C072E4F4D6F4FF202DA15E51C9" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_FFD2FDF187D1AF2B7402202DA15E0C34" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_463314C072E4F4D6F4FF202DA15E51C9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfWarrantOrRightAxis" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_726DFF499C7296350AA5202DA15E2D16" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_463314C072E4F4D6F4FF202DA15E51C9" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_726DFF499C7296350AA5202DA15E2D16" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_84BBE226DF78B6D61E93202DA15F6A6B" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_726DFF499C7296350AA5202DA15E2D16" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_84BBE226DF78B6D61E93202DA15F6A6B" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_SeriesAWarrantsMember" xlink:label="loc_tndm_SeriesAWarrantsMember_27C5A81E8EC707FE3D5C202DA15F93EE" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_84BBE226DF78B6D61E93202DA15F6A6B" xlink:to="loc_tndm_SeriesAWarrantsMember_27C5A81E8EC707FE3D5C202DA15F93EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_A472C658C8F1B5D5E818202DA15F2562" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_463314C072E4F4D6F4FF202DA15E51C9" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_A472C658C8F1B5D5E818202DA15F2562" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_D0B554C35B73D07198DE202DA15F8E56" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_A472C658C8F1B5D5E818202DA15F2562" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_D0B554C35B73D07198DE202DA15F8E56" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_SecondaryPublicOfferingMember" xlink:label="loc_tndm_SecondaryPublicOfferingMember_216F07D8FE4B9E5EDBA5202DA1601BAD" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_D0B554C35B73D07198DE202DA15F8E56" xlink:to="loc_tndm_SecondaryPublicOfferingMember_216F07D8FE4B9E5EDBA5202DA1601BAD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_1CBEF62D0960CE197198202DA160E7EC" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_463314C072E4F4D6F4FF202DA15E51C9" xlink:to="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_1CBEF62D0960CE197198202DA160E7EC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount" xlink:label="loc_us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount_51A47599CF5DC0A01F2B202DA160697B" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_1CBEF62D0960CE197198202DA160E7EC" xlink:to="loc_us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount_51A47599CF5DC0A01F2B202DA160697B" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_PublicOfferingPeriod" xlink:label="loc_tndm_PublicOfferingPeriod_735BFFF4A25A58ADBB7F202DA161E2EC" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_1CBEF62D0960CE197198202DA160E7EC" xlink:to="loc_tndm_PublicOfferingPeriod_735BFFF4A25A58ADBB7F202DA161E2EC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_D64340920C361E02C9F4202DA1619BB6" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_1CBEF62D0960CE197198202DA160E7EC" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_D64340920C361E02C9F4202DA1619BB6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_70AFDDE56A460963690C202DA16187B1" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_1CBEF62D0960CE197198202DA160E7EC" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_70AFDDE56A460963690C202DA16187B1" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_FairValueOfWarrantLiability" xlink:label="loc_tndm_FairValueOfWarrantLiability_6D0C6FF2F4608A2DA20C202DA1611779" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_1CBEF62D0960CE197198202DA160E7EC" xlink:to="loc_tndm_FairValueOfWarrantLiability_6D0C6FF2F4608A2DA20C202DA1611779" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_ClassofWarrantorRightExpired" xlink:label="loc_tndm_ClassofWarrantorRightExpired_3C0D3314514BF3E28129202DA161B130" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_1CBEF62D0960CE197198202DA160E7EC" xlink:to="loc_tndm_ClassofWarrantorRightExpired_3C0D3314514BF3E28129202DA161B130" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfWarrantOrRightOutstanding" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_9C73E11159B9B7234FEB202DA161404F" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_1CBEF62D0960CE197198202DA160E7EC" xlink:to="loc_us-gaap_ClassOfWarrantOrRightOutstanding_9C73E11159B9B7234FEB202DA161404F" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/FairValueMeasurementsScheduleOfAssumptionsUsedToEstimateFairValuesOfCommonStockWarrantsDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_9FC332CAFC5AB7AFB0C9E16629811BC3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_DDECF2EEFD7DDE2D685EE16629811E5A" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_9FC332CAFC5AB7AFB0C9E16629811BC3" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_DDECF2EEFD7DDE2D685EE16629811E5A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfWarrantOrRightAxis" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_CA08C2076EDC2AD4D6D1E16629819791" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_DDECF2EEFD7DDE2D685EE16629811E5A" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_CA08C2076EDC2AD4D6D1E16629819791" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_F7E18E239BC8EE40B54BE166298197A0" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_CA08C2076EDC2AD4D6D1E16629819791" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_F7E18E239BC8EE40B54BE166298197A0" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_SeriesAWarrantsMember" xlink:label="loc_tndm_SeriesAWarrantsMember_84DDD4FCD1839F661BD2E1662981706B" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_F7E18E239BC8EE40B54BE166298197A0" xlink:to="loc_tndm_SeriesAWarrantsMember_84DDD4FCD1839F661BD2E1662981706B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MeasurementInputTypeAxis" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_233F6AB4837A55C7F5C0E1662981665C" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_DDECF2EEFD7DDE2D685EE16629811E5A" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_233F6AB4837A55C7F5C0E1662981665C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MeasurementInputTypeDomain" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_D2430B779AB166B633BEE166298196C5" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_233F6AB4837A55C7F5C0E1662981665C" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_D2430B779AB166B633BEE166298196C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MeasurementInputRiskFreeInterestRateMember" xlink:label="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_A63D4848CC70E12E6229E166298103E6" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_D2430B779AB166B633BEE166298196C5" xlink:to="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_A63D4848CC70E12E6229E166298103E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MeasurementInputExpectedDividendRateMember" xlink:label="loc_us-gaap_MeasurementInputExpectedDividendRateMember_5A6EDDD2C4BECBEBC643E166298106C6" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_D2430B779AB166B633BEE166298196C5" xlink:to="loc_us-gaap_MeasurementInputExpectedDividendRateMember_5A6EDDD2C4BECBEBC643E166298106C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MeasurementInputPriceVolatilityMember" xlink:label="loc_us-gaap_MeasurementInputPriceVolatilityMember_105340D295C0B34B674BE16629814B83" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_D2430B779AB166B633BEE166298196C5" xlink:to="loc_us-gaap_MeasurementInputPriceVolatilityMember_105340D295C0B34B674BE16629814B83" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MeasurementInputExpectedTermMember" xlink:label="loc_us-gaap_MeasurementInputExpectedTermMember_0550BC134A5C39C25C02E16629817EB4" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_D2430B779AB166B633BEE166298196C5" xlink:to="loc_us-gaap_MeasurementInputExpectedTermMember_0550BC134A5C39C25C02E16629817EB4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_48CAAD6D037CAD1CF4FEE1662981899B" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_DDECF2EEFD7DDE2D685EE16629811E5A" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_48CAAD6D037CAD1CF4FEE1662981899B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WarrantsAndRightsOutstandingMeasurementInput" xlink:label="loc_us-gaap_WarrantsAndRightsOutstandingMeasurementInput_E070048D24135ABD32A9E166298123BC" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_48CAAD6D037CAD1CF4FEE1662981899B" xlink:to="loc_us-gaap_WarrantsAndRightsOutstandingMeasurementInput_E070048D24135ABD32A9E166298123BC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WarrantsAndRightsOutstandingTerm" xlink:label="loc_us-gaap_WarrantsAndRightsOutstandingTerm_1E3EFA2499F07C9DF0E2E166298141FB" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_48CAAD6D037CAD1CF4FEE1662981899B" xlink:to="loc_us-gaap_WarrantsAndRightsOutstandingTerm_1E3EFA2499F07C9DF0E2E166298141FB" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/FairValueMeasurementsScheduleOfFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_2C055D79C17736EB37A32F91091CB6B8" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_20A3DB8E2278C97F59522F91091C90F3" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_2C055D79C17736EB37A32F91091CB6B8" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_20A3DB8E2278C97F59522F91091C90F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_C9D68EB5694428B68BAF2F937A52BE93" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_20A3DB8E2278C97F59522F91091C90F3" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_C9D68EB5694428B68BAF2F937A52BE93" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_282A2FF3EE13CE2C2F3A2F93B9EFCE96" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_C9D68EB5694428B68BAF2F937A52BE93" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_282A2FF3EE13CE2C2F3A2F93B9EFCE96" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashEquivalentsMember" xlink:label="loc_us-gaap_CashEquivalentsMember_606135C286F7FE439F3A2F9109201626" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_282A2FF3EE13CE2C2F3A2F93B9EFCE96" xlink:to="loc_us-gaap_CashEquivalentsMember_606135C286F7FE439F3A2F9109201626" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="loc_us-gaap_CommercialPaperMember_C1ABC7936C524BCCA14A2F910921EE56" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_282A2FF3EE13CE2C2F3A2F93B9EFCE96" xlink:to="loc_us-gaap_CommercialPaperMember_C1ABC7936C524BCCA14A2F910921EE56" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_85A2D7EAD9EF7BBCC0E82F9552204C96" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_282A2FF3EE13CE2C2F3A2F93B9EFCE96" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_85A2D7EAD9EF7BBCC0E82F9552204C96" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_USTreasurySecuritiesMember" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_858DA7F48DA3D11F5C4C2F91092182E1" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_282A2FF3EE13CE2C2F3A2F93B9EFCE96" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_858DA7F48DA3D11F5C4C2F91092182E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_EFEA5A4D8A27DDC653382F9109213564" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_282A2FF3EE13CE2C2F3A2F93B9EFCE96" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_EFEA5A4D8A27DDC653382F9109213564" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6620EFBA6444A343EF7C2F91091D3D46" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_20A3DB8E2278C97F59522F91091C90F3" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6620EFBA6444A343EF7C2F91091D3D46" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_EAF27DEEAE13F01607232F91091D7FAC" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6620EFBA6444A343EF7C2F91091D3D46" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_EAF27DEEAE13F01607232F91091D7FAC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_B5D284589D0E705231042F91091DD14D" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_EAF27DEEAE13F01607232F91091D7FAC" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_B5D284589D0E705231042F91091DD14D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_75D887427080F818D00B2F91091DB400" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_20A3DB8E2278C97F59522F91091C90F3" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_75D887427080F818D00B2F91091DB400" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E6A33C9A680E49CE36CA2F91091EE527" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_75D887427080F818D00B2F91091DB400" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E6A33C9A680E49CE36CA2F91091EE527" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_609CB920CEACE36872B82F91091EA708" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E6A33C9A680E49CE36CA2F91091EE527" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_609CB920CEACE36872B82F91091EA708" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_CD852E9A30133D31B2CD2F91091F4FB8" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E6A33C9A680E49CE36CA2F91091EE527" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_CD852E9A30133D31B2CD2F91091F4FB8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_2E55C06424E2B36F07762F91091F71F3" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E6A33C9A680E49CE36CA2F91091EE527" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_2E55C06424E2B36F07762F91091F71F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis_53A67295C6EB93400B312F91091FC76D" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_20A3DB8E2278C97F59522F91091C90F3" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis_53A67295C6EB93400B312F91091FC76D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain" xlink:label="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_0B0F2A09751A8E954B052F91091FC628" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis_53A67295C6EB93400B312F91091FC76D" xlink:to="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_0B0F2A09751A8E954B052F91091FC628" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_us-gaap_WarrantMember_A4AC8C7A097646924CE02F910920CA4A" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_0B0F2A09751A8E954B052F91091FC628" xlink:to="loc_us-gaap_WarrantMember_A4AC8C7A097646924CE02F910920CA4A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_603D0BE8E6D0269182D42F910921A014" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_20A3DB8E2278C97F59522F91091C90F3" xlink:to="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_603D0BE8E6D0269182D42F910921A014" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_7D438FB203644DF6DD4A2F910921BD31" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_603D0BE8E6D0269182D42F910921A014" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_7D438FB203644DF6DD4A2F910921BD31" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_0BE30F2D79CB65F17C4E2F910922B207" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_603D0BE8E6D0269182D42F910921A014" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_0BE30F2D79CB65F17C4E2F910922B207" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/FairValueMeasurementsScheduleOfFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisFootnoteDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_FBB719EC973350F7826EE1B2D28EC185" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_CD936783F07F76625BA3E1B2D28E8D23" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_FBB719EC973350F7826EE1B2D28EC185" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_CD936783F07F76625BA3E1B2D28E8D23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_3006F35875EC4D151C17E1B2D28E4950" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_CD936783F07F76625BA3E1B2D28E8D23" xlink:to="loc_srt_RangeAxis_3006F35875EC4D151C17E1B2D28E4950" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_1141424DD36A0646C889E1B2D2920895" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_3006F35875EC4D151C17E1B2D28E4950" xlink:to="loc_srt_RangeMember_1141424DD36A0646C889E1B2D2920895" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_5B07CE40ABC9B3BE10C9E1B2D29264E3" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_1141424DD36A0646C889E1B2D2920895" xlink:to="loc_srt_MaximumMember_5B07CE40ABC9B3BE10C9E1B2D29264E3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_CD56E57D2C7D442DB37DE1B2D2927BC0" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_CD936783F07F76625BA3E1B2D28E8D23" xlink:to="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_CD56E57D2C7D442DB37DE1B2D2927BC0" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_CashEquivalentsMaturityTerm" xlink:label="loc_tndm_CashEquivalentsMaturityTerm_72C50FD6A1E9C4B6D298E1B2D29290D1" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_CD56E57D2C7D442DB37DE1B2D2927BC0" xlink:to="loc_tndm_CashEquivalentsMaturityTerm_72C50FD6A1E9C4B6D298E1B2D29290D1" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/FairValueMeasurementsSummaryOfChangesInFairValueOfTotalLevel3FinancialAssetsDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_2BC004F50E3107ACD0B32493E9751A61" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_24F97EC1524FFEF21B5C2493E975E656" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_2BC004F50E3107ACD0B32493E9751A61" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_24F97EC1524FFEF21B5C2493E975E656" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease_DF48F77A8015E830E9FC2493E975FE5A" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_2BC004F50E3107ACD0B32493E9751A61" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease_DF48F77A8015E830E9FC2493E975FE5A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_DB89F294EAFCBBFF76BD2493E976F698" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_2BC004F50E3107ACD0B32493E9751A61" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_DB89F294EAFCBBFF76BD2493E976F698" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_27087E5670FF80604EB32493E976A554" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_2BC004F50E3107ACD0B32493E9751A61" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_27087E5670FF80604EB32493E976A554" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/FairValueMeasurementsTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_F66EC4C199D46B23B1B8E16628E554E1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_DD4B86A8A215AA4A176BE16628E570A8" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_F66EC4C199D46B23B1B8E16628E554E1" xlink:to="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_DD4B86A8A215AA4A176BE16628E570A8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock_6E5E0F0B9358023B532DE16628E5F6E2" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_F66EC4C199D46B23B1B8E16628E554E1" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock_6E5E0F0B9358023B532DE16628E5F6E2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_2853B4DEF61BAA6CF15DE16628E591DA" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_F66EC4C199D46B23B1B8E16628E554E1" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_2853B4DEF61BAA6CF15DE16628E591DA" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/Inventories" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryDisclosureAbstract" xlink:label="loc_us-gaap_InventoryDisclosureAbstract_5DA6556255CE4EC6BA3BE16629858FFA" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryDisclosureTextBlock" xlink:label="loc_us-gaap_InventoryDisclosureTextBlock_E48FE75B54248B300D76E1662985C0E5" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InventoryDisclosureAbstract_5DA6556255CE4EC6BA3BE16629858FFA" xlink:to="loc_us-gaap_InventoryDisclosureTextBlock_E48FE75B54248B300D76E1662985C0E5" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/InventoriesSummaryOfInventoriesDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryDisclosureAbstract" xlink:label="loc_us-gaap_InventoryDisclosureAbstract_B5A82F2A110AE097139AE16629A19172" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryRawMaterials" xlink:label="loc_us-gaap_InventoryRawMaterials_EBBDF9F54AF6552F0FF5E16629A1158E" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InventoryDisclosureAbstract_B5A82F2A110AE097139AE16629A19172" xlink:to="loc_us-gaap_InventoryRawMaterials_EBBDF9F54AF6552F0FF5E16629A1158E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryWorkInProcess" xlink:label="loc_us-gaap_InventoryWorkInProcess_30908A0253F70A134178E16629A1BB87" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InventoryDisclosureAbstract_B5A82F2A110AE097139AE16629A19172" xlink:to="loc_us-gaap_InventoryWorkInProcess_30908A0253F70A134178E16629A1BB87" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryFinishedGoods" xlink:label="loc_us-gaap_InventoryFinishedGoods_0BC5AA2DD81FDBA207AEE16629A18949" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InventoryDisclosureAbstract_B5A82F2A110AE097139AE16629A19172" xlink:to="loc_us-gaap_InventoryFinishedGoods_0BC5AA2DD81FDBA207AEE16629A18949" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_42D6B39403CCC8CBC4A2E16629A1A766" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InventoryDisclosureAbstract_B5A82F2A110AE097139AE16629A19172" xlink:to="loc_us-gaap_InventoryNet_42D6B39403CCC8CBC4A2E16629A1A766" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/InventoriesTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryDisclosureAbstract" xlink:label="loc_us-gaap_InventoryDisclosureAbstract_71E3FFB0DDBF09A1C6FCE166298999AC" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfInventoryCurrentTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_30E9150CA6CADC10CF25E1662989F5FC" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InventoryDisclosureAbstract_71E3FFB0DDBF09A1C6FCE166298999AC" xlink:to="loc_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_30E9150CA6CADC10CF25E1662989F5FC" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/Leases" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_7BD8164DB3687912BC61E16628AD3EEC" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeasesTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeasesTextBlock_786E05E2B2C1A5B0BBDDE16628B1372C" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_7BD8164DB3687912BC61E16628AD3EEC" xlink:to="loc_us-gaap_LesseeOperatingLeasesTextBlock_786E05E2B2C1A5B0BBDDE16628B1372C" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/LeasesAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_2912B26A4186E70BEBD62B8A49C6D2C7" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_56A509DE9BF4C14198CD2B8A49C67760" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_2912B26A4186E70BEBD62B8A49C6D2C7" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_56A509DE9BF4C14198CD2B8A49C67760" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_LeaseArrangementsAxis" xlink:label="loc_tndm_LeaseArrangementsAxis_30F19762CCA8BF92DF222B8A49C6C861" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_56A509DE9BF4C14198CD2B8A49C67760" xlink:to="loc_tndm_LeaseArrangementsAxis_30F19762CCA8BF92DF222B8A49C6C861" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_LeaseArrangementsDomain" xlink:label="loc_tndm_LeaseArrangementsDomain_E785797084556C0058512B8A49C657B2" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_LeaseArrangementsAxis_30F19762CCA8BF92DF222B8A49C6C861" xlink:to="loc_tndm_LeaseArrangementsDomain_E785797084556C0058512B8A49C657B2" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_VistaSorrentoLeaseMember" xlink:label="loc_tndm_VistaSorrentoLeaseMember_78C053CA4499BC9D33692B8A49C73883" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_LeaseArrangementsDomain_E785797084556C0058512B8A49C657B2" xlink:to="loc_tndm_VistaSorrentoLeaseMember_78C053CA4499BC9D33692B8A49C73883" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_VistaSorrentoAmendedLeaseMember" xlink:label="loc_tndm_VistaSorrentoAmendedLeaseMember_B1D9A0214432C2DF8BB62B8A49C7B7BA" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_LeaseArrangementsDomain_E785797084556C0058512B8A49C657B2" xlink:to="loc_tndm_VistaSorrentoAmendedLeaseMember_B1D9A0214432C2DF8BB62B8A49C7B7BA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_D90F5DFEBC2DA7F6948F2B8A49C75424" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_56A509DE9BF4C14198CD2B8A49C67760" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_D90F5DFEBC2DA7F6948F2B8A49C75424" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_B9DFC152D6519AFAE5472B8A49C7264A" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_D90F5DFEBC2DA7F6948F2B8A49C75424" xlink:to="loc_us-gaap_TypeOfAdoptionMember_B9DFC152D6519AFAE5472B8A49C7264A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingStandardsUpdate201602Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201602Member_A174F14DBD744C249E962B8A49C8DDA2" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfAdoptionMember_B9DFC152D6519AFAE5472B8A49C7264A" xlink:to="loc_us-gaap_AccountingStandardsUpdate201602Member_A174F14DBD744C249E962B8A49C8DDA2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis" xlink:label="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_62AC92EE5078F2480FE12B8A49C8CFEC" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_56A509DE9BF4C14198CD2B8A49C67760" xlink:to="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_62AC92EE5078F2480FE12B8A49C8CFEC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain" xlink:label="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_4D4E9CA4C737530214972B8A49C80ED7" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_62AC92EE5078F2480FE12B8A49C8CFEC" xlink:to="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_4D4E9CA4C737530214972B8A49C80ED7" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_DifferenceBetweenLeasesGuidanceInEffectBeforeAndAfterTopic842Member" xlink:label="loc_tndm_DifferenceBetweenLeasesGuidanceInEffectBeforeAndAfterTopic842Member_020F4937FFB95F571F4C2B8A49C81F06" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_4D4E9CA4C737530214972B8A49C80ED7" xlink:to="loc_tndm_DifferenceBetweenLeasesGuidanceInEffectBeforeAndAfterTopic842Member_020F4937FFB95F571F4C2B8A49C81F06" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_C9AE4CD0AED2A858B35E2B8A49C98A3D" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_56A509DE9BF4C14198CD2B8A49C67760" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_C9AE4CD0AED2A858B35E2B8A49C98A3D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_F964EFD18AA742C4A8152B8A49C9711D" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_C9AE4CD0AED2A858B35E2B8A49C98A3D" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_F964EFD18AA742C4A8152B8A49C9711D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_53A94E74CA19B3053BF02B8A49C9BE55" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_F964EFD18AA742C4A8152B8A49C9711D" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_53A94E74CA19B3053BF02B8A49C9BE55" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_48D9A2CD171FCC6EEA0C2B8A49CABD5F" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_56A509DE9BF4C14198CD2B8A49C67760" xlink:to="loc_srt_StatementGeographicalAxis_48D9A2CD171FCC6EEA0C2B8A49CABD5F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_6CE2FA39AE2FAC5935452B8A49CA6D0E" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_StatementGeographicalAxis_48D9A2CD171FCC6EEA0C2B8A49CABD5F" xlink:to="loc_srt_SegmentGeographicalDomain_6CE2FA39AE2FAC5935452B8A49CA6D0E" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_VistaSorrentoParkwayMember" xlink:label="loc_tndm_VistaSorrentoParkwayMember_FD28C3D9C18E29E2B7D22B8A49CA2327" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_6CE2FA39AE2FAC5935452B8A49CA6D0E" xlink:to="loc_tndm_VistaSorrentoParkwayMember_FD28C3D9C18E29E2B7D22B8A49CA2327" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_MarindustryPlaceMember" xlink:label="loc_tndm_MarindustryPlaceMember_FA3120BD67627B0741002B8A49CA2B1E" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_6CE2FA39AE2FAC5935452B8A49CA6D0E" xlink:to="loc_tndm_MarindustryPlaceMember_FA3120BD67627B0741002B8A49CA2B1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_78957D95A111997EBAF32B8A49CA1FD0" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_56A509DE9BF4C14198CD2B8A49C67760" xlink:to="loc_srt_RangeAxis_78957D95A111997EBAF32B8A49CA1FD0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_4ADA23C4B17080E872AC2B8A49CB5134" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_78957D95A111997EBAF32B8A49CA1FD0" xlink:to="loc_srt_RangeMember_4ADA23C4B17080E872AC2B8A49CB5134" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_3715739355709F5AE2E42B8A49CB509E" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_4ADA23C4B17080E872AC2B8A49CB5134" xlink:to="loc_srt_MinimumMember_3715739355709F5AE2E42B8A49CB509E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_611E9493B2617E5FB9F82B8A49CB8305" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_4ADA23C4B17080E872AC2B8A49CB5134" xlink:to="loc_srt_MaximumMember_611E9493B2617E5FB9F82B8A49CB8305" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_71C3FEB57AE7C8EA14BB2B8A49CBCB9A" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_56A509DE9BF4C14198CD2B8A49C67760" xlink:to="loc_us-gaap_LesseeLeaseDescriptionLineItems_71C3FEB57AE7C8EA14BB2B8A49CBCB9A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_DD2D0E7D07FF5E7679EA2B8A49CCBD14" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_71C3FEB57AE7C8EA14BB2B8A49CBCB9A" xlink:to="loc_us-gaap_OperatingLeaseLiability_DD2D0E7D07FF5E7679EA2B8A49CCBD14" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredRentCreditCurrent" xlink:label="loc_us-gaap_DeferredRentCreditCurrent_71D7BECF2496550B7B172B8A49CCF0B3" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_71C3FEB57AE7C8EA14BB2B8A49CBCB9A" xlink:to="loc_us-gaap_DeferredRentCreditCurrent_71D7BECF2496550B7B172B8A49CCF0B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredRentCreditNoncurrent" xlink:label="loc_us-gaap_DeferredRentCreditNoncurrent_6E02D747A46289528C5C2B8A49CCF10D" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_71C3FEB57AE7C8EA14BB2B8A49CBCB9A" xlink:to="loc_us-gaap_DeferredRentCreditNoncurrent_6E02D747A46289528C5C2B8A49CCF10D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseTermOfContract" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_73BF4D40B9E839E06BD72B8A49CCB6BD" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_71C3FEB57AE7C8EA14BB2B8A49CBCB9A" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_73BF4D40B9E839E06BD72B8A49CCB6BD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="loc_us-gaap_AreaOfRealEstateProperty_051A5B4921011B0BD1F92B8A49CC3965" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_71C3FEB57AE7C8EA14BB2B8A49CBCB9A" xlink:to="loc_us-gaap_AreaOfRealEstateProperty_051A5B4921011B0BD1F92B8A49CC3965" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseRenewalTerm" xlink:label="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_A5EBBDF51EC94FA443082B8A49CC77DC" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_71C3FEB57AE7C8EA14BB2B8A49CBCB9A" xlink:to="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_A5EBBDF51EC94FA443082B8A49CC77DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_22C1BE5D7B0A78413DCD2B8A49CDFE49" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_71C3FEB57AE7C8EA14BB2B8A49CBCB9A" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_22C1BE5D7B0A78413DCD2B8A49CDFE49" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/LeasesLeasesTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_9766C94FB8320064A46A20CF3CF97CA8" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_3389299271856637F75020CF3F23BB88" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_9766C94FB8320064A46A20CF3CF97CA8" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_3389299271856637F75020CF3F23BB88" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/LeasesScheduleOfFutureMinimumPaymentsUnderNonCancellableOperatingLeasesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_CFFE24377D27D8FA1FB02B8A49BBE81E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_4FDFE9C9D2F3A329C1062B94D20B9DFB" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_CFFE24377D27D8FA1FB02B8A49BBE81E" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_4FDFE9C9D2F3A329C1062B94D20B9DFB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_2336F0BEF3E85F5ADEBD2B953246E51D" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_CFFE24377D27D8FA1FB02B8A49BBE81E" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_2336F0BEF3E85F5ADEBD2B953246E51D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_A5A3E1DC0AACEB9E57D42B9574BBE2B4" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_CFFE24377D27D8FA1FB02B8A49BBE81E" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_A5A3E1DC0AACEB9E57D42B9574BBE2B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_FCC85ED9EF21F023C0422B9590E6487A" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_CFFE24377D27D8FA1FB02B8A49BBE81E" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_FCC85ED9EF21F023C0422B9590E6487A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_AB8E32CD9BCED52AC9832B95A7A81F99" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_CFFE24377D27D8FA1FB02B8A49BBE81E" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_AB8E32CD9BCED52AC9832B95A7A81F99" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_6510832ABB4E88AFC9572B8A49BD8923" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_CFFE24377D27D8FA1FB02B8A49BBE81E" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_6510832ABB4E88AFC9572B8A49BD8923" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_B7B211A079A259361CD02B969F05AD12" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_CFFE24377D27D8FA1FB02B8A49BBE81E" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_B7B211A079A259361CD02B969F05AD12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_A04237D0C1666191C89C2B925502475B" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_CFFE24377D27D8FA1FB02B8A49BBE81E" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_A04237D0C1666191C89C2B925502475B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_05306FFE246A67AB5ABF2B8A49BDA300" xlink:type="locator" />
    <link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_CFFE24377D27D8FA1FB02B8A49BBE81E" xlink:to="loc_us-gaap_OperatingLeaseLiability_05306FFE246A67AB5ABF2B8A49BDA300" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_895D2767D4C31DD976802B8A49BEB671" xlink:type="locator" />
    <link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_CFFE24377D27D8FA1FB02B8A49BBE81E" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_895D2767D4C31DD976802B8A49BEB671" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_59D85636754A73A992D12B8A49BEBE95" xlink:type="locator" />
    <link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_CFFE24377D27D8FA1FB02B8A49BBE81E" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_59D85636754A73A992D12B8A49BEBE95" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/OrganizationAndBasisOfPresentation" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_AE011EC60DF15D08DB38E16629D1DABD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_086316ED0397FFF0C1BCE16629D1EC1C" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_AE011EC60DF15D08DB38E16629D1DABD" xlink:to="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_086316ED0397FFF0C1BCE16629D1EC1C" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/OrganizationAndBasisOfPresentationAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_0514B420E07E189589962B0B4B4BACEF" xlink:type="locator" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_OrganizationAndBasisOfPresentationTable" xlink:label="loc_tndm_OrganizationAndBasisOfPresentationTable_363B24AD38AC2C93A9562B0B4B4DAB90" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_0514B420E07E189589962B0B4B4BACEF" xlink:to="loc_tndm_OrganizationAndBasisOfPresentationTable_363B24AD38AC2C93A9562B0B4B4DAB90" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_4947ACEBEA03C40034672B0B4B4FEAA4" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_OrganizationAndBasisOfPresentationTable_363B24AD38AC2C93A9562B0B4B4DAB90" xlink:to="loc_srt_ProductOrServiceAxis_4947ACEBEA03C40034672B0B4B4FEAA4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_2136080F51691D6A929A2B0B4B4F8037" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductOrServiceAxis_4947ACEBEA03C40034672B0B4B4FEAA4" xlink:to="loc_srt_ProductsAndServicesDomain_2136080F51691D6A929A2B0B4B4F8037" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_InsulinPumpMember" xlink:label="loc_tndm_InsulinPumpMember_DC5C8F73AE35429641D42B0B4B4F4C9F" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_2136080F51691D6A929A2B0B4B4F8037" xlink:to="loc_tndm_InsulinPumpMember_DC5C8F73AE35429641D42B0B4B4F4C9F" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_TSlimX2Member" xlink:label="loc_tndm_TSlimX2Member_7CDF1B8DED25E524CEC12B0B4B5038A9" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_2136080F51691D6A929A2B0B4B4F8037" xlink:to="loc_tndm_TSlimX2Member_7CDF1B8DED25E524CEC12B0B4B5038A9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_1FD9B38F441E44306EB52B0B4B500226" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_OrganizationAndBasisOfPresentationTable_363B24AD38AC2C93A9562B0B4B4DAB90" xlink:to="loc_srt_RangeAxis_1FD9B38F441E44306EB52B0B4B500226" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_9F674039018640FA975A2B0B4B504BEF" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_1FD9B38F441E44306EB52B0B4B500226" xlink:to="loc_srt_RangeMember_9F674039018640FA975A2B0B4B504BEF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_A08FEBC6D329979DC7112B0B4B50F3A3" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_9F674039018640FA975A2B0B4B504BEF" xlink:to="loc_srt_MinimumMember_A08FEBC6D329979DC7112B0B4B50F3A3" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_OrganizationAndBasisOfPresentationLineItems" xlink:label="loc_tndm_OrganizationAndBasisOfPresentationLineItems_411C98A8A573681C92132B0B4B5128FD" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_OrganizationAndBasisOfPresentationTable_363B24AD38AC2C93A9562B0B4B4DAB90" xlink:to="loc_tndm_OrganizationAndBasisOfPresentationLineItems_411C98A8A573681C92132B0B4B5128FD" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_ProductLifeSpanTerm" xlink:label="loc_tndm_ProductLifeSpanTerm_682C10C8376A894C988C2B0B4B51FC35" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_OrganizationAndBasisOfPresentationLineItems_411C98A8A573681C92132B0B4B5128FD" xlink:to="loc_tndm_ProductLifeSpanTerm_682C10C8376A894C988C2B0B4B51FC35" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_PercentageOfNewPumpShipmentsRepresentedByProductHardwarePlatform" xlink:label="loc_tndm_PercentageOfNewPumpShipmentsRepresentedByProductHardwarePlatform_E2ED60763C943BC6F5062B0B4B5113CC" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_OrganizationAndBasisOfPresentationLineItems_411C98A8A573681C92132B0B4B5128FD" xlink:to="loc_tndm_PercentageOfNewPumpShipmentsRepresentedByProductHardwarePlatform_E2ED60763C943BC6F5062B0B4B5113CC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashCashEquivalentsAndShortTermInvestments" xlink:label="loc_us-gaap_CashCashEquivalentsAndShortTermInvestments_4368EB72D2D27D02F6052B0B4B51835F" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_OrganizationAndBasisOfPresentationLineItems_411C98A8A573681C92132B0B4B5128FD" xlink:to="loc_us-gaap_CashCashEquivalentsAndShortTermInvestments_4368EB72D2D27D02F6052B0B4B51835F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_7A25F2D779F2DEABD7FC2B0B4B519E37" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_OrganizationAndBasisOfPresentationLineItems_411C98A8A573681C92132B0B4B5128FD" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_7A25F2D779F2DEABD7FC2B0B4B519E37" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_F0DA6ECD21D332E84D532B0B4B522A14" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_OrganizationAndBasisOfPresentationLineItems_411C98A8A573681C92132B0B4B5128FD" xlink:to="loc_us-gaap_NetIncomeLoss_F0DA6ECD21D332E84D532B0B4B522A14" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/OrganizationAndBasisOfPresentationPolicies" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_480B776D267D26F2F382E16629698EF7" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_9F52C20E1A9766A9B6C8E16629695708" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_480B776D267D26F2F382E16629698EF7" xlink:to="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_9F52C20E1A9766A9B6C8E16629695708" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_UseOfEstimates" xlink:label="loc_us-gaap_UseOfEstimates_4F1E3B3B3FE02C963026E166296D630E" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_480B776D267D26F2F382E16629698EF7" xlink:to="loc_us-gaap_UseOfEstimates_4F1E3B3B3FE02C963026E166296D630E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:label="loc_us-gaap_SegmentReportingPolicyPolicyTextBlock_34A29ACB0E056FEB132FE166296D807A" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_480B776D267D26F2F382E16629698EF7" xlink:to="loc_us-gaap_SegmentReportingPolicyPolicyTextBlock_34A29ACB0E056FEB132FE166296D807A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ReceivablesPolicyTextBlock" xlink:label="loc_us-gaap_ReceivablesPolicyTextBlock_626459404EF2FBB09D6CE166296D522E" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_480B776D267D26F2F382E16629698EF7" xlink:to="loc_us-gaap_ReceivablesPolicyTextBlock_626459404EF2FBB09D6CE166296D522E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:label="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy_625E6931134AC5B82109E166296D2197" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_480B776D267D26F2F382E16629698EF7" xlink:to="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy_625E6931134AC5B82109E166296D2197" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRecognitionPolicyTextBlock" xlink:label="loc_us-gaap_RevenueRecognitionPolicyTextBlock_EBC2B7D629109587E04CE166296DF646" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_480B776D267D26F2F382E16629698EF7" xlink:to="loc_us-gaap_RevenueRecognitionPolicyTextBlock_EBC2B7D629109587E04CE166296DF646" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StandardProductWarrantyPolicy" xlink:label="loc_us-gaap_StandardProductWarrantyPolicy_16AA905A2909918DA789E166296DA55A" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_480B776D267D26F2F382E16629698EF7" xlink:to="loc_us-gaap_StandardProductWarrantyPolicy_16AA905A2909918DA789E166296DA55A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CompensationRelatedCostsPolicyTextBlock" xlink:label="loc_us-gaap_CompensationRelatedCostsPolicyTextBlock_4A99B3B99F89D906B247E166296D7D10" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_480B776D267D26F2F382E16629698EF7" xlink:to="loc_us-gaap_CompensationRelatedCostsPolicyTextBlock_4A99B3B99F89D906B247E166296D7D10" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerSharePolicyTextBlock" xlink:label="loc_us-gaap_EarningsPerSharePolicyTextBlock_7D7C64DCA33A14C0D49AE166296D6E04" xlink:type="locator" />
    <link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_480B776D267D26F2F382E16629698EF7" xlink:to="loc_us-gaap_EarningsPerSharePolicyTextBlock_7D7C64DCA33A14C0D49AE166296D6E04" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:label="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_3C523D8911837742BCC5E166296D77E8" xlink:type="locator" />
    <link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_480B776D267D26F2F382E16629698EF7" xlink:to="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_3C523D8911837742BCC5E166296D77E8" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/ShortTermInvestments" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:label="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_95F11F51B2103DADA3E4E166297DBD47" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock" xlink:label="loc_us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock_0D5CB1FCE00124E2FEF9E166297DFA6C" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_95F11F51B2103DADA3E4E166297DBD47" xlink:to="loc_us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock_0D5CB1FCE00124E2FEF9E166297DFA6C" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/ShortTermInvestmentsSummaryOfEstimatedFairValueOfShortTermInvestmentsDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:label="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_6C76A30C0B0E6487E5F42F0A7A266D86" xlink:type="locator" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_CashCashEquivalentsAndShortTermInvestmentsTable" xlink:label="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsTable_896B1B0D52B35AD7D7A12F0A7A2693FA" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_6C76A30C0B0E6487E5F42F0A7A266D86" xlink:to="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsTable_896B1B0D52B35AD7D7A12F0A7A2693FA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_C278451600D00520D14C2F0A7A2691E2" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsTable_896B1B0D52B35AD7D7A12F0A7A2693FA" xlink:to="loc_us-gaap_InvestmentTypeAxis_C278451600D00520D14C2F0A7A2691E2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_57F02F0D73B89B4A398C2F0A7A26B220" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeAxis_C278451600D00520D14C2F0A7A2691E2" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_57F02F0D73B89B4A398C2F0A7A26B220" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="loc_us-gaap_CommercialPaperMember_52124D15BD0D6AEDADA92F0A7A26A0BB" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_57F02F0D73B89B4A398C2F0A7A26B220" xlink:to="loc_us-gaap_CommercialPaperMember_52124D15BD0D6AEDADA92F0A7A26A0BB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember_5017AE49FFF0D7DA62D62F0A7A26FE75" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_57F02F0D73B89B4A398C2F0A7A26B220" xlink:to="loc_us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember_5017AE49FFF0D7DA62D62F0A7A26FE75" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_USTreasurySecuritiesMember" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_D1EF2B7F27C981F70EDD2F0A7A262021" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_57F02F0D73B89B4A398C2F0A7A26B220" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_D1EF2B7F27C981F70EDD2F0A7A262021" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_D37AA5B6BFBF4ED96B692F0A7A26DA65" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_57F02F0D73B89B4A398C2F0A7A26B220" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_D37AA5B6BFBF4ED96B692F0A7A26DA65" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_3E7AB1E319C3FB7DCAE92F0A7A26E0D2" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsTable_896B1B0D52B35AD7D7A12F0A7A2693FA" xlink:to="loc_srt_RangeAxis_3E7AB1E319C3FB7DCAE92F0A7A26E0D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_FBF34D224960A04D933A2F0A7A2A99FB" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_3E7AB1E319C3FB7DCAE92F0A7A26E0D2" xlink:to="loc_srt_RangeMember_FBF34D224960A04D933A2F0A7A2A99FB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_8744A7A64590A89520B82F0A7A2AF304" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_FBF34D224960A04D933A2F0A7A2A99FB" xlink:to="loc_srt_MaximumMember_8744A7A64590A89520B82F0A7A2AF304" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_CashCashEquivalentsAndShortTermInvestmentsLineItems" xlink:label="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsLineItems_036C3DDEF022642ECAD12F0A7A2B7B6F" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsTable_896B1B0D52B35AD7D7A12F0A7A2693FA" xlink:to="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsLineItems_036C3DDEF022642ECAD12F0A7A2B7B6F" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_ShortTermInvestmentsMaturity" xlink:label="loc_tndm_ShortTermInvestmentsMaturity_5639F6AEE60D0B749BED2F0A7A2BAA8A" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsLineItems_036C3DDEF022642ECAD12F0A7A2B7B6F" xlink:to="loc_tndm_ShortTermInvestmentsMaturity_5639F6AEE60D0B749BED2F0A7A2BAA8A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_F32022A27D86EC8922A82F0A7A2B16AA" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsLineItems_036C3DDEF022642ECAD12F0A7A2B7B6F" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_F32022A27D86EC8922A82F0A7A2B16AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_9118B98DDBB79916E2F42F0A7A2D4C8F" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsLineItems_036C3DDEF022642ECAD12F0A7A2B7B6F" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_9118B98DDBB79916E2F42F0A7A2D4C8F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_7381B86BEB3BDB47B2822F0A7A2D27FB" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsLineItems_036C3DDEF022642ECAD12F0A7A2B7B6F" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_7381B86BEB3BDB47B2822F0A7A2D27FB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_A5D987FCE163BAB4B09D2F0A7A2E7EC5" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsLineItems_036C3DDEF022642ECAD12F0A7A2B7B6F" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_A5D987FCE163BAB4B09D2F0A7A2E7EC5" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_ShortTermInvestmentsAmortizedCost" xlink:label="loc_tndm_ShortTermInvestmentsAmortizedCost_505A0A2A42B75E7208E12F0A7A2E6453" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsLineItems_036C3DDEF022642ECAD12F0A7A2B7B6F" xlink:to="loc_tndm_ShortTermInvestmentsAmortizedCost_505A0A2A42B75E7208E12F0A7A2E6453" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_ShortTermInvestmentsAccumulatedGrossUnrealizedGainBeforeTax" xlink:label="loc_tndm_ShortTermInvestmentsAccumulatedGrossUnrealizedGainBeforeTax_08CED13F5F23BEFED0EC2F0A7A2EA1B7" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsLineItems_036C3DDEF022642ECAD12F0A7A2B7B6F" xlink:to="loc_tndm_ShortTermInvestmentsAccumulatedGrossUnrealizedGainBeforeTax_08CED13F5F23BEFED0EC2F0A7A2EA1B7" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_ShortTermInvestmentsAccumulatedGrossUnrealizedLossBeforeTax" xlink:label="loc_tndm_ShortTermInvestmentsAccumulatedGrossUnrealizedLossBeforeTax_EC16CA4D0A0AAD345AAE2F0A7A2E095F" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsLineItems_036C3DDEF022642ECAD12F0A7A2B7B6F" xlink:to="loc_tndm_ShortTermInvestmentsAccumulatedGrossUnrealizedLossBeforeTax_EC16CA4D0A0AAD345AAE2F0A7A2E095F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="loc_us-gaap_ShortTermInvestments_15B134D5B1865AD3B3272F0A7A2E570C" xlink:type="locator" />
    <link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_CashCashEquivalentsAndShortTermInvestmentsLineItems_036C3DDEF022642ECAD12F0A7A2B7B6F" xlink:to="loc_us-gaap_ShortTermInvestments_15B134D5B1865AD3B3272F0A7A2E570C" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/ShortTermInvestmentsTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:label="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_B4FD4B79F819EAEBD830E16629792981" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock_BAC74E4702E1917093E5E1662979FDD5" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_B4FD4B79F819EAEBD830E16629792981" xlink:to="loc_us-gaap_ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock_BAC74E4702E1917093E5E1662979FDD5" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/StockholdersEquity" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_233B8D620EF61097B81DE16628D55635" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_14C94CB38AC12772CB87E16628D5E556" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_233B8D620EF61097B81DE16628D55635" xlink:to="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_14C94CB38AC12772CB87E16628D5E556" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/StockholdersEquityAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_79DD15961969368CA0C7439BE4C37AA6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_68E8DE974B04783CA040439BE4C4129C" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_79DD15961969368CA0C7439BE4C37AA6" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_68E8DE974B04783CA040439BE4C4129C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingAxis" xlink:label="loc_us-gaap_VestingAxis_122F0DB13A075E63DC86439BE4C4DC99" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_68E8DE974B04783CA040439BE4C4129C" xlink:to="loc_us-gaap_VestingAxis_122F0DB13A075E63DC86439BE4C4DC99" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_2903AE84A1C3F7921372439BE4C54632" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VestingAxis_122F0DB13A075E63DC86439BE4C4DC99" xlink:to="loc_us-gaap_VestingDomain_2903AE84A1C3F7921372439BE4C54632" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_C105E4AC4B218FA71B2A439BE4C57B74" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VestingDomain_2903AE84A1C3F7921372439BE4C54632" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_C105E4AC4B218FA71B2A439BE4C57B74" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_85663170FBEEAB581AD1439BE4C58E6C" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VestingDomain_2903AE84A1C3F7921372439BE4C54632" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_85663170FBEEAB581AD1439BE4C58E6C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_163F6266C6375E981A0D439BE4C58F23" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VestingDomain_2903AE84A1C3F7921372439BE4C54632" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_163F6266C6375E981A0D439BE4C58F23" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_SharebasedCompensationAwardTrancheFourMember" xlink:label="loc_tndm_SharebasedCompensationAwardTrancheFourMember_488808D3A39A7BF914A0439BE4C66F65" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_VestingDomain_2903AE84A1C3F7921372439BE4C54632" xlink:to="loc_tndm_SharebasedCompensationAwardTrancheFourMember_488808D3A39A7BF914A0439BE4C66F65" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardDateAxis" xlink:label="loc_us-gaap_AwardDateAxis_8FB9B4BF435E0AD48C8F439BE4C6CF0B" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_68E8DE974B04783CA040439BE4C4129C" xlink:to="loc_us-gaap_AwardDateAxis_8FB9B4BF435E0AD48C8F439BE4C6CF0B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardDateDomain" xlink:label="loc_us-gaap_AwardDateDomain_5920F0DE9D098D65E07B439BE4C6F923" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardDateAxis_8FB9B4BF435E0AD48C8F439BE4C6CF0B" xlink:to="loc_us-gaap_AwardDateDomain_5920F0DE9D098D65E07B439BE4C6F923" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_December2017Member" xlink:label="loc_tndm_December2017Member_5FCAF9E465DF2A0DB490439BE4C67377" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardDateDomain_5920F0DE9D098D65E07B439BE4C6F923" xlink:to="loc_tndm_December2017Member_5FCAF9E465DF2A0DB490439BE4C67377" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_June2018Member" xlink:label="loc_tndm_June2018Member_4F248EDA032207697377439BE4C77018" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardDateDomain_5920F0DE9D098D65E07B439BE4C6F923" xlink:to="loc_tndm_June2018Member_4F248EDA032207697377439BE4C77018" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_FE7AC6C06DACF3F450B6439BE4C7F548" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_68E8DE974B04783CA040439BE4C4129C" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_FE7AC6C06DACF3F450B6439BE4C7F548" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_C218A27B56127294086B439BE4C7F9B4" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_FE7AC6C06DACF3F450B6439BE4C7F548" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_C218A27B56127294086B439BE4C7F9B4" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_SecondaryPublicOfferingMember" xlink:label="loc_tndm_SecondaryPublicOfferingMember_4F0B10A141AF5F83AEC6439BE4C7AD4B" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_C218A27B56127294086B439BE4C7F9B4" xlink:to="loc_tndm_SecondaryPublicOfferingMember_4F0B10A141AF5F83AEC6439BE4C7AD4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_DD9D309F68CBE3C3B908439BE4C8C9BE" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_C218A27B56127294086B439BE4C7F9B4" xlink:to="loc_us-gaap_EmployeeStockMember_DD9D309F68CBE3C3B908439BE4C8C9BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_2A8CDA7A668DD0D89FC2439BE4C8CF03" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_68E8DE974B04783CA040439BE4C4129C" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_2A8CDA7A668DD0D89FC2439BE4C8CF03" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_9941A0E63554BD9F5147439BE4C83BF5" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_2A8CDA7A668DD0D89FC2439BE4C8CF03" xlink:to="loc_us-gaap_EquityComponentDomain_9941A0E63554BD9F5147439BE4C83BF5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_us-gaap_WarrantMember_E0A6DB7F72C3A1E7A8EF439BE4C9DA6E" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_9941A0E63554BD9F5147439BE4C83BF5" xlink:to="loc_us-gaap_WarrantMember_E0A6DB7F72C3A1E7A8EF439BE4C9DA6E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_602D92D4FDA48A4C7000439BE4C90323" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_68E8DE974B04783CA040439BE4C4129C" xlink:to="loc_us-gaap_AwardTypeAxis_602D92D4FDA48A4C7000439BE4C90323" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8C12998778A2229EDB3D439BE4C931E7" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_602D92D4FDA48A4C7000439BE4C90323" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8C12998778A2229EDB3D439BE4C931E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_A28C5DC36077B193925F439BE4C92AB0" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8C12998778A2229EDB3D439BE4C931E7" xlink:to="loc_us-gaap_EmployeeStockOptionMember_A28C5DC36077B193925F439BE4C92AB0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_3F5A78A4940DF62CBFA2439BE4CAB19F" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_68E8DE974B04783CA040439BE4C4129C" xlink:to="loc_us-gaap_PlanNameAxis_3F5A78A4940DF62CBFA2439BE4CAB19F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_C055DF13BFC0CFAA9272439BE4CA4305" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameAxis_3F5A78A4940DF62CBFA2439BE4CAB19F" xlink:to="loc_us-gaap_PlanNameDomain_C055DF13BFC0CFAA9272439BE4CA4305" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_TwoThousandThirteenPlanMember" xlink:label="loc_tndm_TwoThousandThirteenPlanMember_202634BDBA08B4B123B2439BE4CA6052" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_C055DF13BFC0CFAA9272439BE4CA4305" xlink:to="loc_tndm_TwoThousandThirteenPlanMember_202634BDBA08B4B123B2439BE4CA6052" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_68E8DE974B04783CA040439BE4C4129C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_270148A1CC26345CAD3D439BE4CB888B" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_270148A1CC26345CAD3D439BE4CB888B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_484D75476D12A4F0DEF9439BE4CB7833" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_484D75476D12A4F0DEF9439BE4CB7833" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_ProceedsFromIssuanceOfSecondaryPublicOfferingGross" xlink:label="loc_tndm_ProceedsFromIssuanceOfSecondaryPublicOfferingGross_89B694545F81A7412E44439BE4CB913D" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:to="loc_tndm_ProceedsFromIssuanceOfSecondaryPublicOfferingGross_89B694545F81A7412E44439BE4CB913D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_7A9A1F10A039DD0A9B38439BE4CCCDDD" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_7A9A1F10A039DD0A9B38439BE4CCCDDD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_4C4CD2CE37211241FE93439BE4CC086F" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_4C4CD2CE37211241FE93439BE4CC086F" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_OfferingPeriod" xlink:label="loc_tndm_OfferingPeriod_EF7905671E0D78F30460439BE4CC410F" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:to="loc_tndm_OfferingPeriod_EF7905671E0D78F30460439BE4CC410F" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_PurchasePeriod" xlink:label="loc_tndm_PurchasePeriod_99C9F721AAD4BBB8CBDE439BE4CCFC53" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:to="loc_tndm_PurchasePeriod_99C9F721AAD4BBB8CBDE439BE4CCFC53" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward_37BF8F8505EF0E87A51C439BE4CD4B02" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward_37BF8F8505EF0E87A51C439BE4CD4B02" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_D4EC0ECB9571DD2802AB439BE4CDC27C" xlink:type="locator" />
    <link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_D4EC0ECB9571DD2802AB439BE4CDC27C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_3026AEDA15435A10A5BA439BE4CD757F" xlink:type="locator" />
    <link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_3026AEDA15435A10A5BA439BE4CD757F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_DC9464659EB478B2C0D7439BE4CED9B7" xlink:type="locator" />
    <link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_DC9464659EB478B2C0D7439BE4CED9B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_8817E6FF69164C4A16A8439BE4CEF4D1" xlink:type="locator" />
    <link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3B5C5662628BE74BCC55439BE4CBDCE5" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_8817E6FF69164C4A16A8439BE4CEF4D1" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/StockholdersEquityScheduleOfAssumptionsUsedInBlackScholesOptionPricingModelDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_B52B28292DFC543FF1B0E16629994E29" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_74D98B4D4B5846EF4712E1662999A7FD" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_B52B28292DFC543FF1B0E16629994E29" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_74D98B4D4B5846EF4712E1662999A7FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_7D17DA805E732ACA4757E1662999FB0D" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_74D98B4D4B5846EF4712E1662999A7FD" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_7D17DA805E732ACA4757E1662999FB0D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_A3C54A36133E3F486114E1662999A9DF" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_7D17DA805E732ACA4757E1662999FB0D" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_A3C54A36133E3F486114E1662999A9DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_4FC185A9EE62D91555A7E166299D7672" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_A3C54A36133E3F486114E1662999A9DF" xlink:to="loc_us-gaap_EmployeeStockOptionMember_4FC185A9EE62D91555A7E166299D7672" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_BCBFE129EEF3F3E797A0E166299DF76B" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_A3C54A36133E3F486114E1662999A9DF" xlink:to="loc_us-gaap_EmployeeStockMember_BCBFE129EEF3F3E797A0E166299DF76B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_84C1B0BE7CCA98E58B6FE166299D6B41" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_74D98B4D4B5846EF4712E1662999A7FD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_84C1B0BE7CCA98E58B6FE166299D6B41" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_F672629E8E089AED7ECCE166299D8353" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_84C1B0BE7CCA98E58B6FE166299D6B41" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_F672629E8E089AED7ECCE166299D8353" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_137F58B0C312C8840003E166299D7522" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_84C1B0BE7CCA98E58B6FE166299D6B41" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_137F58B0C312C8840003E166299D7522" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_B38028D64939AB246718E166299D4E3C" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_84C1B0BE7CCA98E58B6FE166299D6B41" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_B38028D64939AB246718E166299D4E3C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_334C1CCC8C2775EB433DE166299D9647" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_84C1B0BE7CCA98E58B6FE166299D6B41" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_334C1CCC8C2775EB433DE166299D9647" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_3246DDD0BB3A83B53AC2E166299D0310" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_84C1B0BE7CCA98E58B6FE166299D6B41" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_3246DDD0BB3A83B53AC2E166299D0310" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/StockholdersEquityScheduleOfSharesOfCommonStockReservedForFutureIssuanceDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_9EA25FFEADA2468DA62D252079C6F1D2" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CC56FDAA6A7AAB2972FF252079C71466" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_9EA25FFEADA2468DA62D252079C6F1D2" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CC56FDAA6A7AAB2972FF252079C71466" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_9B40B18D2138C977A125252079C7257C" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CC56FDAA6A7AAB2972FF252079C71466" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_9B40B18D2138C977A125252079C7257C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_6688EF5F6347604E6440252079C8DAA2" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_9B40B18D2138C977A125252079C7257C" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_6688EF5F6347604E6440252079C8DAA2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_us-gaap_WarrantMember_CE4A87C72895B3D96001252079C8FCFD" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_6688EF5F6347604E6440252079C8DAA2" xlink:to="loc_us-gaap_WarrantMember_CE4A87C72895B3D96001252079C8FCFD" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_StockOptionsIssuedAndOutstandingMember" xlink:label="loc_tndm_StockOptionsIssuedAndOutstandingMember_4387895B0E152EA2F389252079C8381B" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_6688EF5F6347604E6440252079C8DAA2" xlink:to="loc_tndm_StockOptionsIssuedAndOutstandingMember_4387895B0E152EA2F389252079C8381B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GrantMember" xlink:label="loc_us-gaap_GrantMember_B83F0F3CA782BE35A5A6253D6AC8A5D5" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_6688EF5F6347604E6440252079C8DAA2" xlink:to="loc_us-gaap_GrantMember_B83F0F3CA782BE35A5A6253D6AC8A5D5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockCompensationPlanMember" xlink:label="loc_us-gaap_StockCompensationPlanMember_F75F6BE9D33C321894F7252079C8FF0F" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_6688EF5F6347604E6440252079C8DAA2" xlink:to="loc_us-gaap_StockCompensationPlanMember_F75F6BE9D33C321894F7252079C8FF0F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_22F79BE16374F6772569252079C97612" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CC56FDAA6A7AAB2972FF252079C71466" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_22F79BE16374F6772569252079C97612" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_66D29E15E8510205426C252079C9F363" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_22F79BE16374F6772569252079C97612" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_66D29E15E8510205426C252079C9F363" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/StockholdersEquitySummaryForAllocationOfStockBasedCompensationExpenseDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_1829BE30A96CFA0E0F5FE166292DA272" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_03C746742F7972724183E166292D998C" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_1829BE30A96CFA0E0F5FE166292DA272" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_03C746742F7972724183E166292D998C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_6F29A38849066ADA51E4E166292D8813" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_03C746742F7972724183E166292D998C" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_6F29A38849066ADA51E4E166292D8813" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_719C0234E620C21F348EE166292DDE34" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_6F29A38849066ADA51E4E166292D8813" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_719C0234E620C21F348EE166292DDE34" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="loc_us-gaap_CostOfSalesMember_5064A487A34C16CF7934E166292D873F" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_719C0234E620C21F348EE166292DDE34" xlink:to="loc_us-gaap_CostOfSalesMember_5064A487A34C16CF7934E166292D873F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_D3FCDB0064DC08718FFAE166292D1A54" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_719C0234E620C21F348EE166292DDE34" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_D3FCDB0064DC08718FFAE166292D1A54" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_A052C9C4170FF1710846E166292D8C88" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_719C0234E620C21F348EE166292DDE34" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_A052C9C4170FF1710846E166292D8C88" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2DBB909E1DF7C1CEF162E1662931943C" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_03C746742F7972724183E166292D998C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2DBB909E1DF7C1CEF162E1662931943C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_B9A3136E9256F9CCCF8FE16629313DBA" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2DBB909E1DF7C1CEF162E1662931943C" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_B9A3136E9256F9CCCF8FE16629313DBA" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/StockholdersEquityTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_AF682E1BBD8487384B1EE16629190E89" xlink:type="locator" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock" xlink:label="loc_tndm_ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock_2C08FFE001D120DAC996E16629193934" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_AF682E1BBD8487384B1EE16629190E89" xlink:to="loc_tndm_ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock_2C08FFE001D120DAC996E16629193934" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_28F05FC75070040EB845E1662919EEE1" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_AF682E1BBD8487384B1EE16629190E89" xlink:to="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_28F05FC75070040EB845E1662919EEE1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_C2B7887EDE5078A407A3E16629198A47" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_AF682E1BBD8487384B1EE16629190E89" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_C2B7887EDE5078A407A3E16629198A47" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_82393A969C36A37C35BDE16628918AAE" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="loc_us-gaap_SignificantAccountingPoliciesTextBlock_A80D503335908F1D4FC9E16628911D80" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_82393A969C36A37C35BDE16628918AAE" xlink:to="loc_us-gaap_SignificantAccountingPoliciesTextBlock_A80D503335908F1D4FC9E16628911D80" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_F5598F2948BCA2EAC8E22A5A45B99AB5" xlink:type="locator" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_SummaryOfSignificantAccountingPoliciesTable" xlink:label="loc_tndm_SummaryOfSignificantAccountingPoliciesTable_2B74751F11EED131D90F2A5A45BA1177" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_F5598F2948BCA2EAC8E22A5A45B99AB5" xlink:to="loc_tndm_SummaryOfSignificantAccountingPoliciesTable_2B74751F11EED131D90F2A5A45BA1177" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_D30217178E476485E7062A5A45BF4FE7" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesTable_2B74751F11EED131D90F2A5A45BA1177" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_D30217178E476485E7062A5A45BF4FE7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_746C470132AEE01E8D492A5A45BF368C" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_D30217178E476485E7062A5A45BF4FE7" xlink:to="loc_us-gaap_TypeOfAdoptionMember_746C470132AEE01E8D492A5A45BF368C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingStandardsUpdate201409Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201409Member_8DFC8550B261DF3421AA2A5A45BFD84E" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TypeOfAdoptionMember_746C470132AEE01E8D492A5A45BF368C" xlink:to="loc_us-gaap_AccountingStandardsUpdate201409Member_8DFC8550B261DF3421AA2A5A45BFD84E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_CE405F926D83E899A91C2A5A45C0B365" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesTable_2B74751F11EED131D90F2A5A45BA1177" xlink:to="loc_srt_ProductOrServiceAxis_CE405F926D83E899A91C2A5A45C0B365" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_A5F142EFBD7E91777A3B2A5A45C0A774" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductOrServiceAxis_CE405F926D83E899A91C2A5A45C0B365" xlink:to="loc_srt_ProductsAndServicesDomain_A5F142EFBD7E91777A3B2A5A45C0A774" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_ComplementaryProductsMember" xlink:label="loc_tndm_ComplementaryProductsMember_2F3FA1111A6DADC457032A5A45C08389" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_A5F142EFBD7E91777A3B2A5A45C0A774" xlink:to="loc_tndm_ComplementaryProductsMember_2F3FA1111A6DADC457032A5A45C08389" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_TandemPumpMember" xlink:label="loc_tndm_TandemPumpMember_4EC31F99A6301C1473D12A5A45C06C3D" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_A5F142EFBD7E91777A3B2A5A45C0A774" xlink:to="loc_tndm_TandemPumpMember_4EC31F99A6301C1473D12A5A45C06C3D" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_SlimCartridgesAndInfusionSetsMember" xlink:label="loc_tndm_SlimCartridgesAndInfusionSetsMember_9C0FAAE76A0050420C052A5A45C1EBE2" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_A5F142EFBD7E91777A3B2A5A45C0A774" xlink:to="loc_tndm_SlimCartridgesAndInfusionSetsMember_9C0FAAE76A0050420C052A5A45C1EBE2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_477B10507928ED3922E62A5A45C178DC" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesTable_2B74751F11EED131D90F2A5A45BA1177" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_477B10507928ED3922E62A5A45C178DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_687C071B93762ED3D5512A5A45C1DDD4" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_477B10507928ED3922E62A5A45C178DC" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_687C071B93762ED3D5512A5A45C1DDD4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WarrantyReservesMember" xlink:label="loc_us-gaap_WarrantyReservesMember_A8DF3F4860CBEE3F34C02A5A45C1A138" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_687C071B93762ED3D5512A5A45C1DDD4" xlink:to="loc_us-gaap_WarrantyReservesMember_A8DF3F4860CBEE3F34C02A5A45C1A138" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_SummaryOfSignificantAccountingPoliciesLineItems" xlink:label="loc_tndm_SummaryOfSignificantAccountingPoliciesLineItems_38ECD3BE80B55A1B4ECE2A5A45C27137" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesTable_2B74751F11EED131D90F2A5A45BA1177" xlink:to="loc_tndm_SummaryOfSignificantAccountingPoliciesLineItems_38ECD3BE80B55A1B4ECE2A5A45C27137" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NumberOfOperatingSegments" xlink:label="loc_us-gaap_NumberOfOperatingSegments_DA6E46FC6C0E74546C6C2A5A45C2FBBC" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesLineItems_38ECD3BE80B55A1B4ECE2A5A45C27137" xlink:to="loc_us-gaap_NumberOfOperatingSegments_DA6E46FC6C0E74546C6C2A5A45C2FBBC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1" xlink:label="loc_us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1_1B3009043C616DA252E22A5A45C24629" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesLineItems_38ECD3BE80B55A1B4ECE2A5A45C27137" xlink:to="loc_us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1_1B3009043C616DA252E22A5A45C24629" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_3305262C52BD1C980C322A5A45C2D267" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesLineItems_38ECD3BE80B55A1B4ECE2A5A45C27137" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_3305262C52BD1C980C322A5A45C2D267" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_1649A8CEBD5FCD44DCF12A5A45C2D089" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesLineItems_38ECD3BE80B55A1B4ECE2A5A45C27137" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_1649A8CEBD5FCD44DCF12A5A45C2D089" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_OfferedPeriodForSalesReturnPriorToExpiration" xlink:label="loc_tndm_OfferedPeriodForSalesReturnPriorToExpiration_70ADA40F9460D4304FAC2A5A45C3EFDB" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesLineItems_38ECD3BE80B55A1B4ECE2A5A45C27137" xlink:to="loc_tndm_OfferedPeriodForSalesReturnPriorToExpiration_70ADA40F9460D4304FAC2A5A45C3EFDB" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_AllowanceForSalesReturns" xlink:label="loc_tndm_AllowanceForSalesReturns_546D084078AB46A5933A2A5A45C31D5B" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesLineItems_38ECD3BE80B55A1B4ECE2A5A45C27137" xlink:to="loc_tndm_AllowanceForSalesReturns_546D084078AB46A5933A2A5A45C31D5B" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_ProductsWarrantyPeriod" xlink:label="loc_tndm_ProductsWarrantyPeriod_1E8990DF48F36954A96F2A5A45C312BD" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesLineItems_38ECD3BE80B55A1B4ECE2A5A45C27137" xlink:to="loc_tndm_ProductsWarrantyPeriod_1E8990DF48F36954A96F2A5A45C312BD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductWarrantyAccrual" xlink:label="loc_us-gaap_ProductWarrantyAccrual_9D5E043706E6BF28DE8D2A5A45C346D4" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesLineItems_38ECD3BE80B55A1B4ECE2A5A45C27137" xlink:to="loc_us-gaap_ProductWarrantyAccrual_9D5E043706E6BF28DE8D2A5A45C346D4" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail1" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_6F8424358F62C4F291EDE16629C19B48" xlink:type="locator" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_SummaryOfSignificantAccountingPoliciesTable" xlink:label="loc_tndm_SummaryOfSignificantAccountingPoliciesTable_BDBF11F237CB7A8F3FC9E16629C1D2ED" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_6F8424358F62C4F291EDE16629C19B48" xlink:to="loc_tndm_SummaryOfSignificantAccountingPoliciesTable_BDBF11F237CB7A8F3FC9E16629C1D2ED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_B67DC20243126803B5F0E16629C1E31B" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesTable_BDBF11F237CB7A8F3FC9E16629C1D2ED" xlink:to="loc_srt_ProductOrServiceAxis_B67DC20243126803B5F0E16629C1E31B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_62F535C93D7C5AC9BF63E16629C1E3BE" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductOrServiceAxis_B67DC20243126803B5F0E16629C1E31B" xlink:to="loc_srt_ProductsAndServicesDomain_62F535C93D7C5AC9BF63E16629C1E3BE" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_ComplementaryProductsMember" xlink:label="loc_tndm_ComplementaryProductsMember_FC6C28FEE1E043B141DAE16629C5FF08" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_62F535C93D7C5AC9BF63E16629C1E3BE" xlink:to="loc_tndm_ComplementaryProductsMember_FC6C28FEE1E043B141DAE16629C5FF08" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_SummaryOfSignificantAccountingPoliciesLineItems" xlink:label="loc_tndm_SummaryOfSignificantAccountingPoliciesLineItems_534BE1CD6E86873EE79BE16629C585CB" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesTable_BDBF11F237CB7A8F3FC9E16629C1D2ED" xlink:to="loc_tndm_SummaryOfSignificantAccountingPoliciesLineItems_534BE1CD6E86873EE79BE16629C585CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_A2396BCE965AEFDA04C0E16629C5EE6A" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_tndm_SummaryOfSignificantAccountingPoliciesLineItems_534BE1CD6E86873EE79BE16629C585CB" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_A2396BCE965AEFDA04C0E16629C5EE6A" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfAntiDilutiveSecuritiesDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_D1C3C361DAB58D758956E16628BDAB4D" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_804A15582926FC39C883E16628BDE85D" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_D1C3C361DAB58D758956E16628BDAB4D" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_804A15582926FC39C883E16628BDE85D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_66C8596F47C4BD1E9DB6E16628BDF512" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_804A15582926FC39C883E16628BDE85D" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_66C8596F47C4BD1E9DB6E16628BDF512" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_82347E042D671F02CC7AE16628BDE0E0" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_66C8596F47C4BD1E9DB6E16628BDF512" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_82347E042D671F02CC7AE16628BDE0E0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_2BBB4BA4CB413ADBAD49E16628BD13B3" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_82347E042D671F02CC7AE16628BDE0E0" xlink:to="loc_us-gaap_EmployeeStockMember_2BBB4BA4CB413ADBAD49E16628BD13B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_F351F382D310F319BCBBE16628BD303E" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_804A15582926FC39C883E16628BDE85D" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_F351F382D310F319BCBBE16628BD303E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3D229AE9207176367C7AE16628BD69A9" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_F351F382D310F319BCBBE16628BD303E" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3D229AE9207176367C7AE16628BD69A9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_us-gaap_WarrantMember_0AD8CC7F6C3CB78CE1A1E16628BD7190" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3D229AE9207176367C7AE16628BD69A9" xlink:to="loc_us-gaap_WarrantMember_0AD8CC7F6C3CB78CE1A1E16628BD7190" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_0D28443229C91FDD7D61E16628BD8FE0" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3D229AE9207176367C7AE16628BD69A9" xlink:to="loc_us-gaap_EmployeeStockOptionMember_0D28443229C91FDD7D61E16628BD8FE0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_59D28A83455524228AD8E16628BD5400" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_804A15582926FC39C883E16628BDE85D" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_59D28A83455524228AD8E16628BD5400" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_DAB69A59E1910C5341A9E16628BD3863" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_59D28A83455524228AD8E16628BD5400" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_DAB69A59E1910C5341A9E16628BD3863" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfReconciliationOfChangeInProductWarrantyLiabilitiesDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_4A5C73A1A26BCDE7CE59252289EF9D1C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward" xlink:label="loc_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_B77129F75FB8C2DB4C38252289EF9AE2" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_4A5C73A1A26BCDE7CE59252289EF9D1C" xlink:to="loc_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_B77129F75FB8C2DB4C38252289EF9AE2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductWarrantyAccrual" xlink:label="loc_us-gaap_ProductWarrantyAccrual_76E8AC19AC1A4B1031AA252289EFDDC3" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_B77129F75FB8C2DB4C38252289EF9AE2" xlink:to="loc_us-gaap_ProductWarrantyAccrual_76E8AC19AC1A4B1031AA252289EFDDC3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductWarrantyAccrualWarrantiesIssued" xlink:label="loc_us-gaap_ProductWarrantyAccrualWarrantiesIssued_70795A0CCF2D83AD08D3252289F04E53" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_B77129F75FB8C2DB4C38252289EF9AE2" xlink:to="loc_us-gaap_ProductWarrantyAccrualWarrantiesIssued_70795A0CCF2D83AD08D3252289F04E53" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductWarrantyAccrualPayments" xlink:label="loc_us-gaap_ProductWarrantyAccrualPayments_C2D506F5D645276677CE252289F03988" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_B77129F75FB8C2DB4C38252289EF9AE2" xlink:to="loc_us-gaap_ProductWarrantyAccrualPayments_C2D506F5D645276677CE252289F03988" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease" xlink:label="loc_us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease_EC4820E1FC0E04CE7711252289F09200" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_B77129F75FB8C2DB4C38252289EF9AE2" xlink:to="loc_us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease_EC4820E1FC0E04CE7711252289F09200" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductWarrantyAccrual" xlink:label="loc_us-gaap_ProductWarrantyAccrual_624DEFB5E47295C14D8B252289F081F5" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward_B77129F75FB8C2DB4C38252289EF9AE2" xlink:to="loc_us-gaap_ProductWarrantyAccrual_624DEFB5E47295C14D8B252289F081F5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductWarrantyAccrualClassifiedCurrent" xlink:label="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_C20CE89421C6C4153308252289F043C9" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_4A5C73A1A26BCDE7CE59252289EF9D1C" xlink:to="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_C20CE89421C6C4153308252289F043C9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductWarrantyAccrualNoncurrent" xlink:label="loc_us-gaap_ProductWarrantyAccrualNoncurrent_D2F48CDAD3E9FE19CCF1252289F1D0F2" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_4A5C73A1A26BCDE7CE59252289EF9D1C" xlink:to="loc_us-gaap_ProductWarrantyAccrualNoncurrent_D2F48CDAD3E9FE19CCF1252289F1D0F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductWarrantyAccrual" xlink:label="loc_us-gaap_ProductWarrantyAccrual_4AC91DD74008605185B6252289F11F51" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_4A5C73A1A26BCDE7CE59252289EF9D1C" xlink:to="loc_us-gaap_ProductWarrantyAccrual_4AC91DD74008605185B6252289F11F51" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_82EF2BCF1B5E0F6D07E1E16629D138FE" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_A5EEAA156C08CB2C2111E16629D11DEA" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_82EF2BCF1B5E0F6D07E1E16629D138FE" xlink:to="loc_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_A5EEAA156C08CB2C2111E16629D11DEA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_F5C9E7316E86C0240112E16629D1BB32" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_82EF2BCF1B5E0F6D07E1E16629D138FE" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_F5C9E7316E86C0240112E16629D1BB32" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/TermLoanAgreement" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_64353EDC21AEA55B383DE16628E56EE4" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtDisclosureTextBlock" xlink:label="loc_us-gaap_DebtDisclosureTextBlock_7C54290ED26DAD29F225E16628E52F33" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_64353EDC21AEA55B383DE16628E56EE4" xlink:to="loc_us-gaap_DebtDisclosureTextBlock_7C54290ED26DAD29F225E16628E52F33" xlink:type="arc" />
  </link:presentationLink>
  <link:presentationLink xlink:role="http://www.tandemdiabetes.com/role/TermLoanAgreementAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_3DB678845AEB292E43E9439BE4E09FF4" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_F285A96F079AC6AF00F6439BE4E115CB" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_3DB678845AEB292E43E9439BE4E09FF4" xlink:to="loc_us-gaap_DebtInstrumentTable_F285A96F079AC6AF00F6439BE4E115CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_2E13B28A86F766ED504A439BE4E1F8F4" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_F285A96F079AC6AF00F6439BE4E115CB" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_2E13B28A86F766ED504A439BE4E1F8F4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_B8F00F7029D7D2391A7B439BE4E15D58" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2E13B28A86F766ED504A439BE4E1F8F4" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_B8F00F7029D7D2391A7B439BE4E15D58" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_TermLoanMember" xlink:label="loc_tndm_TermLoanMember_29B721874DFC0E6D7572439BE4E2D54F" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_B8F00F7029D7D2391A7B439BE4E15D58" xlink:to="loc_tndm_TermLoanMember_29B721874DFC0E6D7572439BE4E2D54F" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_TermLoanAmendmentsMember" xlink:label="loc_tndm_TermLoanAmendmentsMember_58596A2D593495D1FC39439BE4E384AA" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_B8F00F7029D7D2391A7B439BE4E15D58" xlink:to="loc_tndm_TermLoanAmendmentsMember_58596A2D593495D1FC39439BE4E384AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_F285A96F079AC6AF00F6439BE4E115CB" xlink:to="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_2E7F20CAF05185BDA975439BE4E40EA2" xlink:type="locator" />
    <link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:to="loc_us-gaap_LongTermDebt_2E7F20CAF05185BDA975439BE4E40EA2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestPayableCurrentAndNoncurrent" xlink:label="loc_us-gaap_InterestPayableCurrentAndNoncurrent_95E19D726960B06A8B7F439BE4E468BE" xlink:type="locator" />
    <link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:to="loc_us-gaap_InterestPayableCurrentAndNoncurrent_95E19D726960B06A8B7F439BE4E468BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinancialServicesLiabilities" xlink:label="loc_us-gaap_FinancialServicesLiabilities_BAC26719CBC8C5C95D99439BE4E45615" xlink:type="locator" />
    <link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:to="loc_us-gaap_FinancialServicesLiabilities_BAC26719CBC8C5C95D99439BE4E45615" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_EBB5998903F0A6BA75EE439BE4E4A72F" xlink:type="locator" />
    <link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_EBB5998903F0A6BA75EE439BE4E4A72F" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_InterestRate" xlink:label="loc_tndm_InterestRate_90A1EEABB4F2C446F6C1439BE4E40385" xlink:type="locator" />
    <link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:to="loc_tndm_InterestRate_90A1EEABB4F2C446F6C1439BE4E40385" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_CompoundedInterestRate" xlink:label="loc_tndm_CompoundedInterestRate_B7473F5F9BEB88F75E96439BE4E54E31" xlink:type="locator" />
    <link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:to="loc_tndm_CompoundedInterestRate_B7473F5F9BEB88F75E96439BE4E54E31" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentPaymentTerms" xlink:label="loc_us-gaap_DebtInstrumentPaymentTerms_86383F64819F299820AE439BE4E5A8C0" xlink:type="locator" />
    <link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:to="loc_us-gaap_DebtInstrumentPaymentTerms_86383F64819F299820AE439BE4E5A8C0" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_DebtInstrumentDateOfLastRequiredInterestPayment" xlink:label="loc_tndm_DebtInstrumentDateOfLastRequiredInterestPayment_7965ACBD82D5BF64BCAB439BE4E67534" xlink:type="locator" />
    <link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:to="loc_tndm_DebtInstrumentDateOfLastRequiredInterestPayment_7965ACBD82D5BF64BCAB439BE4E67534" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_1415F83620B0C8A822A0439BE4E666BA" xlink:type="locator" />
    <link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_1415F83620B0C8A822A0439BE4E666BA" xlink:type="arc" />
    <link:loc xlink:href="tndm-20190630.xsd#tndm_ClassOfWarrantOrRightsOutstandingContractualLife" xlink:label="loc_tndm_ClassOfWarrantOrRightsOutstandingContractualLife_63D974F0A29B76674F43439BE4E6DE94" xlink:type="locator" />
    <link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/terseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:to="loc_tndm_ClassOfWarrantOrRightsOutstandingContractualLife_63D974F0A29B76674F43439BE4E6DE94" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfWarrantOrRightOutstanding" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_44D702DF0EFC5AD97CA7439BE4E637EC" xlink:type="locator" />
    <link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:to="loc_us-gaap_ClassOfWarrantOrRightOutstanding_44D702DF0EFC5AD97CA7439BE4E637EC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_9E95A6BAB5A1BDF71545439BE4E6B143" xlink:type="locator" />
    <link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3B9C72A20B49D8543075439BE4E45EE4" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_9E95A6BAB5A1BDF71545439BE4E6B143" xlink:type="arc" />
  </link:presentationLink>
</link:linkbase>
