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  <element id="gmab_BoardOfDirectorMijkeZachariasseMember" name="BoardOfDirectorMijkeZachariasseMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_BoardOfDirectorDanielBrunoMember" name="BoardOfDirectorDanielBrunoMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ExecutiveManagementMember" name="ExecutiveManagementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ExecutiveManagerJanVanDeWinkelMember" name="ExecutiveManagerJanVanDeWinkelMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ExecutiveManagerDavidA.EatwellMember" name="ExecutiveManagerDavidA.EatwellMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ExecutiveManagerJudithKlimovskyMember" name="ExecutiveManagerJudithKlimovskyMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_NumberOfWarrantsGrantedDuringPeriod" name="NumberOfWarrantsGrantedDuringPeriod" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsExercisedDuringPeriod" name="NumberOfWarrantsExercisedDuringPeriod" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_MarketableSecuritiesMember" name="MarketableSecuritiesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_TripleaRatingMember" name="TripleaRatingMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_FairValueAdjustmentOfMarketableSecuritiesDuringPeriod" name="FairValueAdjustmentOfMarketableSecuritiesDuringPeriod" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_MarketableSecuritiesAverageEffectiveDuration" name="MarketableSecuritiesAverageEffectiveDuration" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_PercentageOfMarketableSecurities" name="PercentageOfMarketableSecurities" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ForeignExchangeAdjustmentOfMarketableSecurities" name="ForeignExchangeAdjustmentOfMarketableSecurities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DisclosureOfWarrantsActivityTableTextBlock" name="DisclosureOfWarrantsActivityTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_RestrictedStockUnitsRSUsMember" name="RestrictedStockUnitsRSUsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_StockRepurchaseFirstAuthorizationMember" name="StockRepurchaseFirstAuthorizationMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_StockRepurchaseSecondAuthorizationMember" name="StockRepurchaseSecondAuthorizationMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod" name="IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ShareBasedArrangementPeriodFromVestingDateHolderReceivesShares" name="ShareBasedArrangementPeriodFromVestingDateHolderReceivesShares" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ShareBasedArrangementNumberOfSharesPerRsu" name="ShareBasedArrangementNumberOfSharesPerRsu" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ShareBasedArrangementNumberOfAuthorization" name="ShareBasedArrangementNumberOfAuthorization" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfSharesAuthorizedToBeRepurchased" name="NumberOfSharesAuthorizedToBeRepurchased" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_SharesRepurchasedNominalValue" name="SharesRepurchasedNominalValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ShareRepurchasedDuringPeriodShares" name="ShareRepurchasedDuringPeriodShares" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ShareRepurchasedDuringPeriodValue" name="ShareRepurchasedDuringPeriodValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_SharesAvailableForRepurchase" name="SharesAvailableForRepurchase" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_SharesAvailableForRepurchaseAmount" name="SharesAvailableForRepurchaseAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_TreasurySharesAcquired" name="TreasurySharesAcquired" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_PercentageOfShareCapitalRepurchased" name="PercentageOfShareCapitalRepurchased" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_WarrantsGrantedFromAugust2004UntilApril2012Member" name="WarrantsGrantedFromAugust2004UntilApril2012Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WarrantsGrantedFromApril2012UntilMarch2017Member" name="WarrantsGrantedFromApril2012UntilMarch2017Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WarrantsGrantedFromMarch2017Member" name="WarrantsGrantedFromMarch2017Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WarrantVestingPeriod" name="WarrantVestingPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsOutstanding" name="NumberOfWarrantsOutstanding" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageExercisePriceOfWarrantsGranted" name="WeightedAverageExercisePriceOfWarrantsGranted" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageExercisePriceOfWarrantsExercised" name="WeightedAverageExercisePriceOfWarrantsExercised" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_PercentageOfShareCapitalAttributedToExerciseOfWarrants" name="PercentageOfShareCapitalAttributedToExerciseOfWarrants" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_WeightedAverageExercisePriceOfFairValueOfWarrants" name="WeightedAverageExercisePriceOfFairValueOfWarrants" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DescriptionOfAccountingPolicyForJudgmentsAndEstimatesPolicyTextBlock" name="DescriptionOfAccountingPolicyForJudgmentsAndEstimatesPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfExternalInvestmentManagers" name="NumberOfExternalInvestmentManagers" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_IfrsOverAllotmentOptionMember" name="IfrsOverAllotmentOptionMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeTable" name="IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeTable" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeLineItems" name="CollaborativeArrangementAndArrangementOtherThanCollaborativeLineItems" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_CurevacCollaborationMember" name="CurevacCollaborationMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_CollaborationAgreementsDevelopmentRegulatoryAndCommercialMilestonePayment" name="CollaborationAgreementsDevelopmentRegulatoryAndCommercialMilestonePayment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_ScheduleOfSegmentDisclosuresInFinancialStatementsTableTextBlock" name="ScheduleOfSegmentDisclosuresInFinancialStatementsTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_StaffCostsAreIncludedInIncomeStatementAsFollowsAbstract" name="StaffCostsAreIncludedInIncomeStatementAsFollowsAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_NumberOfFullTimeEmployment" name="NumberOfFullTimeEmployment" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ExpensesOnGovernmentGrants" name="ExpensesOnGovernmentGrants" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_WeightedAverageSharePriceWarrantsGranted" name="WeightedAverageSharePriceWarrantsGranted" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageExercisePriceWarrantsGranted" name="WeightedAverageExercisePriceWarrantsGranted" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageExpectedDividendYieldWarrantsGranted" name="WeightedAverageExpectedDividendYieldWarrantsGranted" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageExpectedVolatilityWarrantsGranted" name="WeightedAverageExpectedVolatilityWarrantsGranted" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageRiskFreeInterestRateWarrantsGranted" name="WeightedAverageRiskFreeInterestRateWarrantsGranted" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageExpectedLifeWarrantsGranted" name="WeightedAverageExpectedLifeWarrantsGranted" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageFairValueOfWarrantsGranted" name="WeightedAverageFairValueOfWarrantsGranted" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_ShareBasedInstrumentsMember" name="ShareBasedInstrumentsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ValuationAllowanceMember" name="ValuationAllowanceMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_OperatingAssetsAndLiabilitiesAbstract" name="OperatingAssetsAndLiabilitiesAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_AntidilutiveWarrantsExcludedFromComputationOfEarningsPerShareAmount" name="AntidilutiveWarrantsExcludedFromComputationOfEarningsPerShareAmount" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_AntidilutiveWarrantsVestedExcludedFromComputationOfEarningsPerShareAmount" name="AntidilutiveWarrantsVestedExcludedFromComputationOfEarningsPerShareAmount" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_OperatingAssetsAndLiabilitiesTextBlock" name="OperatingAssetsAndLiabilitiesTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ImmaticsBiotechnologiesGmbhMember" name="ImmaticsBiotechnologiesGmbhMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfProprietaryTargetsOfLicense" name="NumberOfProprietaryTargetsOfLicense" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfAdditionalProprietaryTargetsOfLicense" name="NumberOfAdditionalProprietaryTargetsOfLicense" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ActualUsefulLifeIntangibleAssetsOtherThanGoodwill" name="ActualUsefulLifeIntangibleAssetsOtherThanGoodwill" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_EquipmentFurnitureAndFixturesMember" name="EquipmentFurnitureAndFixturesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DepreciationOnDisposalPropertyPlantAndEquipment" name="DepreciationOnDisposalPropertyPlantAndEquipment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DepreciationAmortizationAndImpairmentsIncludedInResearchAndDevelopmentExpenses" name="DepreciationAmortizationAndImpairmentsIncludedInResearchAndDevelopmentExpenses" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DepreciationAmortizationAndImpairmentsIncludedInGeneralAndAdministrativeExpenses" name="DepreciationAmortizationAndImpairmentsIncludedInGeneralAndAdministrativeExpenses" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_EstimatedCapitalExpenditureYetToBeIncurred" name="EstimatedCapitalExpenditureYetToBeIncurred" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_PercentageOfOwnershipInterest" name="PercentageOfOwnershipInterest" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_FairValueOfOtherInvestment" name="FairValueOfOtherInvestment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_CollaborationAgreementsReceivables" name="CollaborationAgreementsReceivables" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_IncreaseInProvisions" name="IncreaseInProvisions" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_CollaborationAgreementsLiabilities" name="CollaborationAgreementsLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DefinedContributionPlansPensionObligation" name="DefinedContributionPlansPensionObligation" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_AverageNumberOfTreasurySharesOutstanding" name="AverageNumberOfTreasurySharesOutstanding" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_AverageNumberOfOrdinarySharesExcludingOutstanding" name="AverageNumberOfOrdinarySharesExcludingOutstanding" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DisclosureOfCapitalStructureFinancialRiskAndOtherItemsAbstract" name="DisclosureOfCapitalStructureFinancialRiskAndOtherItemsAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DisclosureOfImpactOfExchangeRateOnNetResultBeforeTaxTableTextBlock" name="DisclosureOfImpactOfExchangeRateOnNetResultBeforeTaxTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DisclosureOfMaturityProfileOfOurMarketableSecuritiesTableTextBlock" name="DisclosureOfMaturityProfileOfOurMarketableSecuritiesTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ScheduleOfPortfolioOfMarketableSecurities" name="ScheduleOfPortfolioOfMarketableSecurities" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ProceedsFromPartnershipCollaborationIncome" name="ProceedsFromPartnershipCollaborationIncome" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_MarketableSecuritiesIncludingInterestReceivables" name="MarketableSecuritiesIncludingInterestReceivables" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_BankDepositsIncludingShortTermMarketableSecurities" name="BankDepositsIncludingShortTermMarketableSecurities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_PercentageOfRevenue" name="PercentageOfRevenue" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_PercentageOfMarketableSecuritiesInvested" name="PercentageOfMarketableSecuritiesInvested" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_PercentageOfPossibleIncreaseDecreaseInExchangeRate" name="PercentageOfPossibleIncreaseDecreaseInExchangeRate" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ImpactOfPossibleIncreaseDecreaseInExchangeRate" name="ImpactOfPossibleIncreaseDecreaseInExchangeRate" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_PositiveFluctuationInForeignCurrencyExchangeRate" name="PositiveFluctuationInForeignCurrencyExchangeRate" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NegativeFluctuationInForeignCurrencyExchangeRate" name="NegativeFluctuationInForeignCurrencyExchangeRate" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_AverageEffectiveDurationOfPortfolio" name="AverageEffectiveDurationOfPortfolio" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ReceivablesExPrepaymentsMember" name="ReceivablesExPrepaymentsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_IfrsCashAndCashEquivalentsMember" name="IfrsCashAndCashEquivalentsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_OtherPayablesMember" name="OtherPayablesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DkkPortfolioMember" name="DkkPortfolioMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_KingdomOfDenmarkBondsAndTreasuryBillsMember" name="KingdomOfDenmarkBondsAndTreasuryBillsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DanishMortgageBackedSecuritiesMember" name="DanishMortgageBackedSecuritiesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_EurPortfolioMember" name="EurPortfolioMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_EuropeanGovernmentBondsAndTreasuryBillsMember" name="EuropeanGovernmentBondsAndTreasuryBillsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_UsdPortfolioMember" name="UsdPortfolioMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_UsGovernmentBondsAndTreasuryBillsMember" name="UsGovernmentBondsAndTreasuryBillsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_GbpPortfolioMember" name="GbpPortfolioMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_UkGovernmentBondsAndTreasuryBillsMember" name="UkGovernmentBondsAndTreasuryBillsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DecreaseInForeignExchangeRateDueToDecreaseInDollarDenominatedPortfolio" name="DecreaseInForeignExchangeRateDueToDecreaseInDollarDenominatedPortfolio" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_IncreaseInForeignExchangeRateDueToIncreaseInDollarDenominatedPortfolio" name="IncreaseInForeignExchangeRateDueToIncreaseInDollarDenominatedPortfolio" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_OtherDisclosureAbstract" name="OtherDisclosureAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_OtherDisclosureTextBlock" name="OtherDisclosureTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_BasicBoardFee" name="BasicBoardFee" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_IfrsForecastMember" name="IfrsForecastMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfVotes" name="NumberOfVotes" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_IncreaseDecreaseInValueOfSharesAuthorized" name="IncreaseDecreaseInValueOfSharesAuthorized" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_AdditionalIncreaseDecreaseInValueOfSharesAuthorized" name="AdditionalIncreaseDecreaseInValueOfSharesAuthorized" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_IfrsDebtConversionConvertedInstrumentAmount" name="IfrsDebtConversionConvertedInstrumentAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_IfrsDebtConversionConvertedInstrumentSharesIssued" name="IfrsDebtConversionConvertedInstrumentSharesIssued" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_TermOfConversionOfDebtToEquity" name="TermOfConversionOfDebtToEquity" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsAuthorized" name="NumberOfWarrantsAuthorized" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsIssued" name="NumberOfWarrantsIssued" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsReissued" name="NumberOfWarrantsReissued" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsRemainingAvailableForIssue" name="NumberOfWarrantsRemainingAvailableForIssue" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsRemainingAvailableForReissue" name="NumberOfWarrantsRemainingAvailableForReissue" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_IfrsSaleOfStockAxis" name="IfrsSaleOfStockAxis" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_IfrsSaleOfStockDomain" name="IfrsSaleOfStockDomain" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_AmericanDepositoryReceiptMember" name="AmericanDepositoryReceiptMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfSharesAbstract" name="NumberOfSharesAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_TreasurySharesSold" name="TreasurySharesSold" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ShareCapitalAbstract" name="ShareCapitalAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ProportionOfShareCapitalAbstract" name="ProportionOfShareCapitalAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_PercentageOfShareCapitalOnPurchaseOfTreasuryShares" name="PercentageOfShareCapitalOnPurchaseOfTreasuryShares" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_PercentageOfShareCapitalOnSalleOfTreasuryShares" name="PercentageOfShareCapitalOnSalleOfTreasuryShares" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_CostOfTreasurySharesAbstract" name="CostOfTreasurySharesAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_TreasurySharesAtCost" name="TreasurySharesAtCost" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_PurchaseOfTreasurySharesAtCost" name="PurchaseOfTreasurySharesAtCost" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_CostOfTreasurySharesUsedForFundingProgram" name="CostOfTreasurySharesUsedForFundingProgram" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsSettled" name="NumberOfWarrantsSettled" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsTransferred" name="NumberOfWarrantsTransferred" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsCancelled" name="NumberOfWarrantsCancelled" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_FormerMemberOfBoardOfDirectorsAndEmployeesMember" name="FormerMemberOfBoardOfDirectorsAndEmployeesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_EmployeesMember" name="EmployeesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsExpired" name="NumberOfWarrantsExpired" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsTransfers" name="NumberOfWarrantsTransfers" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsExercisable" name="NumberOfWarrantsExercisable" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfWarrantsExercisableInMoney" name="NumberOfWarrantsExercisableInMoney" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageExercisePriceOfWarrantsOutstanding" name="WeightedAverageExercisePriceOfWarrantsOutstanding" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageExercisePriceWarrantsOutstanding" name="WeightedAverageExercisePriceWarrantsOutstanding" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageRemainingContractualLifeOfOutstandingWarrants" name="WeightedAverageRemainingContractualLifeOfOutstandingWarrants" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_InterestExpenseAndOtherFinancialExpensesOnFinancialLiabilitiesMeasuredAtAmortisedCost" name="InterestExpenseAndOtherFinancialExpensesOnFinancialLiabilitiesMeasuredAtAmortisedCost" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageExercisePriceOfWarrantsExpired" name="WeightedAverageExercisePriceOfWarrantsExpired" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageExercisePriceOfWarrantsCancelled" name="WeightedAverageExercisePriceOfWarrantsCancelled" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageExercisePriceOfWarrantsExercisable" name="WeightedAverageExercisePriceOfWarrantsExercisable" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_WeightedAverageExercisePriceOfWarrantsExercisableInMoney" name="WeightedAverageExercisePriceOfWarrantsExercisableInMoney" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems" name="ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_KeyManagementPersonnelCompensationCommitteeFees" name="KeyManagementPersonnelCompensationCommitteeFees" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_KeyManagementPersonnelCompensationBaseSalary" name="KeyManagementPersonnelCompensationBaseSalary" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_KeyManagementPersonnelCompensationOtherBenefits" name="KeyManagementPersonnelCompensationOtherBenefits" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_KeyManagementPersonnelCompensationAnnualCashBonus" name="KeyManagementPersonnelCompensationAnnualCashBonus" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_GenmabB.v.Member" name="GenmabB.v.Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_GenmabHoldingB.v.Member" name="GenmabHoldingB.v.Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_GenmabUsInc.Member" name="GenmabUsInc.Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_GenmabK.k.Member" name="GenmabK.k.Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ProportionOfOwnershipInterestAndVotingRightsInSubsidiary" name="ProportionOfOwnershipInterestAndVotingRightsInSubsidiary" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_CommitmentsAbstract" name="CommitmentsAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ShortTermContractualObligations" name="ShortTermContractualObligations" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ContractualObligationsTerm" name="ContractualObligationsTerm" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ContingentCommitmentsAmount" name="ContingentCommitmentsAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DerivativeFinancialInstrumentsAbstract" name="DerivativeFinancialInstrumentsAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_DerivativeLiabilitiesCollateralAmount" name="DerivativeLiabilitiesCollateralAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_RequirementOfCashPosition" name="RequirementOfCashPosition" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_AuditorSRemunerationForAuditRelatedServices" name="AuditorSRemunerationForAuditRelatedServices" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_TotalAdjustmentsForNonCashTransactions" name="TotalAdjustmentsForNonCashTransactions" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_CollaborationsAgreementTieredRoyaltyPercentage" name="CollaborationsAgreementTieredRoyaltyPercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_CollaborationsAgreementRoyaltyObligationExpirationTermAfterFirstSaleOfProduct" name="CollaborationsAgreementRoyaltyObligationExpirationTermAfterFirstSaleOfProduct" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_CollaborationsAgreementNonCancerTreatmentRoyaltyPercentageOnWorldWideNetSales" name="CollaborationsAgreementNonCancerTreatmentRoyaltyPercentageOnWorldWideNetSales" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_CollaborationsAgreementCostAndProfitSharingRatio" name="CollaborationsAgreementCostAndProfitSharingRatio" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_NumberOfPeriodTerminationSeverancePaymentChangeInControl" name="NumberOfPeriodTerminationSeverancePaymentChangeInControl" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_OptionExercisablePeriodCommercialLicense" name="OptionExercisablePeriodCommercialLicense" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_CountriesOutsideUnitedStatesAndJapanMember" name="CountriesOutsideUnitedStatesAndJapanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_RatioOfShareOfProfitsBeforeIncomeTaxes" name="RatioOfShareOfProfitsBeforeIncomeTaxes" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ClinicalDevelopmentAndCommercialSuccessAcrossAllThreeProgramsMember" name="ClinicalDevelopmentAndCommercialSuccessAcrossAllThreeProgramsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_NumberOfPerformanceObligations" name="NumberOfPerformanceObligations" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_NumberOfDeliveryLicenses" name="NumberOfDeliveryLicenses" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_AgreementsWithAbbvieMember" name="AgreementsWithAbbvieMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_ResultsForYearTextBlock" name="ResultsForYearTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_BoardOfDirectorJonathanPeacockMember" name="BoardOfDirectorJonathanPeacockMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_ExecutiveManagerAnthonyManciniMember" name="ExecutiveManagerAnthonyManciniMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_CollaborationsAgreementPaymentReceivedForLostRoyalties" name="CollaborationsAgreementPaymentReceivedForLostRoyalties" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_NumberOfAdditionalProgramEntitledToBeWorked" name="NumberOfAdditionalProgramEntitledToBeWorked" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_CollaborationsAgreementInitialPaymentReceived" name="CollaborationsAgreementInitialPaymentReceived" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_NumberOfLicenseOptionsExercised" name="NumberOfLicenseOptionsExercised" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_NumberOfDuoBodyProductCandidatesCreated" name="NumberOfDuoBodyProductCandidatesCreated" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_JanssenBiotechInc.Member" name="JanssenBiotechInc.Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_CorporateTaxReceivable" name="CorporateTaxReceivable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_ExercisePrice1408.00Member" name="ExercisePrice1408.00Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="gmab_ShareCapitalExerciseOfWarrants" name="ShareCapitalExerciseOfWarrants" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_TaxEffectOfValuationAllowance" name="TaxEffectOfValuationAllowance" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gmab_IncomeTaxExpenseAdjustmentToValuationAllowance" name="IncomeTaxExpenseAdjustmentToValuationAllowance" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>
