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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2021-03-01T21:23:26.8715307+00:00 -->
<!-- Version            : 5.0.1.571 -->
<!-- Package ID         : f25d9750961f4c4a87ed031a26dbbe00 -->
<!-- Copyright (c) 2021 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="kod_AccruedResearchAndDevelopmentPolicyTextBlock" name="AccruedResearchAndDevelopmentPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_LiabilityRelatedToSaleOfFutureRoyaltiesPolicyTextBlock" name="LiabilityRelatedToSaleOfFutureRoyaltiesPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_ScheduleOfAccruedLiabilitiesAndOtherCurrentLiabilitiesTableTextBlock" name="ScheduleOfAccruedLiabilitiesAndOtherCurrentLiabilitiesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock" name="ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_ScheduleOfShareBasedPaymentAwardEmployeeStockOptionsValuationAssumptionsTableTextBlock" name="ScheduleOfShareBasedPaymentAwardEmployeeStockOptionsValuationAssumptionsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_ScheduleOfShareBasedPaymentAwardNonEmployeeStockOptionsValuationAssumptionsTableTextBlock" name="ScheduleOfShareBasedPaymentAwardNonEmployeeStockOptionsValuationAssumptionsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_ScheduleOfShareBasedPaymentAwardPerformanceBasedAwardsAndRSUsValuationAssumptionsTableTextBlock" name="ScheduleOfShareBasedPaymentAwardPerformanceBasedAwardsAndRSUsValuationAssumptionsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_GrossProceedsFromInitialPublicOffering" name="GrossProceedsFromInitialPublicOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="kod_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems" name="OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_OrganizationConsolidationAndPresentationOfFinancialStatementsTable" name="OrganizationConsolidationAndPresentationOfFinancialStatementsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_WarrantsExercisedIntoConvertiblePreferredSharesThenConvertedMember" name="WarrantsExercisedIntoConvertiblePreferredSharesThenConvertedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_TwoThousandSeventeenConvertibleNotesMember" name="TwoThousandSeventeenConvertibleNotesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_TwoThousandEighteenConvertibleNotesMember" name="TwoThousandEighteenConvertibleNotesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_FollowOnOfferingMember" name="FollowOnOfferingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_WarrantsExercised" name="WarrantsExercised" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="kod_ConversionOfRedeemableConvertiblePreferredStockWarrantsIntoCommonStockWarrantsShares" name="ConversionOfRedeemableConvertiblePreferredStockWarrantsIntoCommonStockWarrantsShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_GrossProceedsFromIssuanceOfCommonStock" name="GrossProceedsFromIssuanceOfCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="kod_SummaryOfSignificantAccountingPoliciesLineItems" name="SummaryOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_SummaryOfSignificantAccountingPoliciesTable" name="SummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_LaboratoryEquipmentMember" name="LaboratoryEquipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_ComputerEquipmentAndOfficeEquipmentMember" name="ComputerEquipmentAndOfficeEquipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_BakerBrosAdvisorsLPMember" name="BakerBrosAdvisorsLPMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_FundingAgreementMember" name="FundingAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_CappedPercentageOfRoyaltyOnFutureNetSales" name="CappedPercentageOfRoyaltyOnFutureNetSales" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_RelatedPartyTransactionOwnershipPercentageThreshold" name="RelatedPartyTransactionOwnershipPercentageThreshold" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="kod_DerecognitionOfNoncurrentDeferredLiabilities" name="DerecognitionOfNoncurrentDeferredLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_ComputerSoftwareMember" name="ComputerSoftwareMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_AccruedClinicalTrialAndRelatedCostsCurrent" name="AccruedClinicalTrialAndRelatedCostsCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_AccruedResearchAndDevelopmentCurrent" name="AccruedResearchAndDevelopmentCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_AccruedLegalFeesCurrent" name="AccruedLegalFeesCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_RepurchaseAgreementMember" name="RepurchaseAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_TransfersBetweenHierarchyLevels" name="TransfersBetweenHierarchyLevels" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent" name="AvailableForSaleDebtSecuritiesAmortizedCostBasisCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="kod_AvailableForSaleDebtSecuritiesAmortizedCostBasisNoncurrent" name="AvailableForSaleDebtSecuritiesAmortizedCostBasisNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="kod_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxNonCurrent" name="AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxNonCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTaxNonCurrent" name="AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTaxNonCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="kod_NumberOfLeasedBuildings" name="NumberOfLeasedBuildings" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_LesseeOperatingLeaseInitialTermOfContract" name="LesseeOperatingLeaseInitialTermOfContract" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_LesseeOperatingLeaseMonthlyRentExpense" name="LesseeOperatingLeaseMonthlyRentExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="kod_AnnualRentYearOverYearIncreasePercentage" name="AnnualRentYearOverYearIncreasePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_LesseeOperatingLeaseRentAbatement" name="LesseeOperatingLeaseRentAbatement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="kod_TenantImprovementAllowance" name="TenantImprovementAllowance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_CashCollateralizedLetterOfCredit" name="CashCollateralizedLetterOfCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_NumberOfOptionsToExtendLeaseTerm" name="NumberOfOptionsToExtendLeaseTerm" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_CommitmentsAndContingenciesDisclosureLineItems" name="CommitmentsAndContingenciesDisclosureLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_CommitmentsAndContingenciesDisclosureTable" name="CommitmentsAndContingenciesDisclosureTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_LeaseAgreementOnJuneTwoThousandAndTwentyMember" name="LeaseAgreementOnJuneTwoThousandAndTwentyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_BuildingOneMember" name="BuildingOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_BuildingTwoMember" name="BuildingTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_LeaseAgreementOnAprilTwoThousandAndTwentyMember" name="LeaseAgreementOnAprilTwoThousandAndTwentyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_OfficeAndLaboratorySpaceMember" name="OfficeAndLaboratorySpaceMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_ManufacturingAgreementMember" name="ManufacturingAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_ClinicalAndCommercialSupplyMember" name="ClinicalAndCommercialSupplyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_LeaseAgreementOnAprilAndJuneTwoThousandAndTwentyMember" name="LeaseAgreementOnAprilAndJuneTwoThousandAndTwentyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_LonzaMember" name="LonzaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_TenantImprovementAllowanceAgreementMember" name="TenantImprovementAllowanceAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_TenantImprovementAllowancePayableMember" name="TenantImprovementAllowancePayableMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_AutomaticRenewalInterval" name="AutomaticRenewalInterval" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_EstimatedCapitalContributions" name="EstimatedCapitalContributions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="kod_ContractualObligationDueInSecondYearAndAfter" name="ContractualObligationDueInSecondYearAndAfter" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_ManufacturingAgreementInitialTerm" name="ManufacturingAgreementInitialTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_ManufacturingAgreementTermThatCanBeExtended" name="ManufacturingAgreementTermThatCanBeExtended" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_UnrecordedUnconditionalPurchaseObligationCancellationFees" name="UnrecordedUnconditionalPurchaseObligationCancellationFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="kod_ContractualObligationPeriod" name="ContractualObligationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_NoncancellablePurchaseCommitmentsIncludingPotentialCancellationFees" name="NoncancellablePurchaseCommitmentsIncludingPotentialCancellationFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_UnrecordedMilestoneAndRoyaltyPayments" name="UnrecordedMilestoneAndRoyaltyPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_DeferredTaxAssetsTaxOperatingLeaseLiability" name="DeferredTaxAssetsTaxOperatingLeaseLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="kod_DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset" name="DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_DeferredTaxLiabilitiesCapitalizedLegalFees" name="DeferredTaxLiabilitiesCapitalizedLegalFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_IncomeTaxesLineItems" name="IncomeTaxesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_IncomeTaxesTable" name="IncomeTaxesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_NetOperatingLossNotSubjectToExpirationMember" name="NetOperatingLossNotSubjectToExpirationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_OperatingLossCarryforwardsExpirationStartYear" name="OperatingLossCarryforwardsExpirationStartYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_ResearchAndDevelopmentCreditCarryforwardsExpirationStartYear" name="ResearchAndDevelopmentCreditCarryforwardsExpirationStartYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_ResearchAndDevelopmentCreditCarryforwardsExpirationYearDescription" name="ResearchAndDevelopmentCreditCarryforwardsExpirationYearDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_EffectiveIncomeTaxRateReconciliationSaleOfFutureRoyalties" name="EffectiveIncomeTaxRateReconciliationSaleOfFutureRoyalties" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_EffectiveIncomeTaxRateReconciliationFairValueAdjustments" name="EffectiveIncomeTaxRateReconciliationFairValueAdjustments" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_EffectiveIncomeTaxRateReconciliationExtinguishmentOfConvertibleNote" name="EffectiveIncomeTaxRateReconciliationExtinguishmentOfConvertibleNote" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_IncomeTaxExaminationNumberOfPeriodsOpenForExamination" name="IncomeTaxExaminationNumberOfPeriodsOpenForExamination" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_CommonStockNumberOfVotesPerShare" name="CommonStockNumberOfVotesPerShare" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_StockOptionsOutstandingAndReleaseOfRestrictedSharesMember" name="StockOptionsOutstandingAndReleaseOfRestrictedSharesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_TwoThousandEighteenEquityIncentivePlanMember" name="TwoThousandEighteenEquityIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_TwoThousandEighteenEmployeeSharePurchasePlanMember" name="TwoThousandEighteenEmployeeSharePurchasePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecreasePercentage" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecreasePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisePrice" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_IncentiveStockOptionsMember" name="IncentiveStockOptionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_IncentiveStockOptionsGrantedToGreaterThanTenPercentStockholderMember" name="IncentiveStockOptionsGrantedToGreaterThanTenPercentStockholderMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_NonEmployeeStockOptionMember" name="NonEmployeeStockOptionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_OptionsGrantedToNonEmployeesMember" name="OptionsGrantedToNonEmployeesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_PerformanceBasedEquityAwardsMember" name="PerformanceBasedEquityAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_PerformanceBasedStockOptionsMember" name="PerformanceBasedStockOptionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_PerformanceBasedRestrictedStockUnitMember" name="PerformanceBasedRestrictedStockUnitMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_TwoThousandEighteenAndTwoThousandFifteenEquityIncentivePlanMember" name="TwoThousandEighteenAndTwoThousandFifteenEquityIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="kod_SharesWithheldRelatedToNetShareSettlementOfRSUsWeightedAverageGrantDateFairValue" name="SharesWithheldRelatedToNetShareSettlementOfRSUsWeightedAverageGrantDateFairValue" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingDescription" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_WeightedAverageNumberOfSharesOutstandingAdjustment" name="WeightedAverageNumberOfSharesOutstandingAdjustment" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_DefinedContributionPlanEmployerMatchingContributionCapOnEmployeeContributionLimit" name="DefinedContributionPlanEmployerMatchingContributionCapOnEmployeeContributionLimit" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="kod_RelatedPartyTransactionOwnershipPercentage" name="RelatedPartyTransactionOwnershipPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="kod_PercentageOfRepurchaseOfRoyalties" name="PercentageOfRepurchaseOfRoyalties" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="kod_FundsPayableUponEnrollmentOfPatients" name="FundsPayableUponEnrollmentOfPatients" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="kod_PercentageOfPatientsToBeEnrolled" name="PercentageOfPatientsToBeEnrolled" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="kod_InterestExpenseLiabilityRelatedToSaleOfFutureRoyalties" name="InterestExpenseLiabilityRelatedToSaleOfFutureRoyalties" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
</xsd:schema>
