<?xml version="1.0" encoding="us-ascii"?>
<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2019-11-04T14:28:55.7396407+00:00 -->
<!-- Version            : 5.0.0.208 -->
<!-- Package ID         : cc382964dc9d4c1994508221a8b07ba7 -->
<!-- Copyright (c) 2019 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="stim_IncomeStatementMember" name="IncomeStatementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_DistributionAgreementPeriod" name="DistributionAgreementPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_DistributionAgreementRenewalPeriod" name="DistributionAgreementRenewalPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_NumberOfCustomerAccountedForMoreThanTenPercentageOfRevenues" name="NumberOfCustomerAccountedForMoreThanTenPercentageOfRevenues" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_NumberOfCustomerAccountedForTenPercentageOfRevenues" name="NumberOfCustomerAccountedForTenPercentageOfRevenues" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_FairValueMeasurementInputConvertiblePreferredStockOfWarrantLiability" name="FairValueMeasurementInputConvertiblePreferredStockOfWarrantLiability" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="stim_FairValueMeasurementInputRemainingTerm" name="FairValueMeasurementInputRemainingTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_MeasurementInputEstimatedFairValueOfConvertiblePreferredStockMember" name="MeasurementInputEstimatedFairValueOfConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_AreaOfLeaseFacility" name="AreaOfLeaseFacility" type="num:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="stim_LesseeOperatingLeaseExtendedDateOfMaturityMonthAndYear" name="LesseeOperatingLeaseExtendedDateOfMaturityMonthAndYear" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_AdditionalLeaseFacilityAreaThroughModificationOfContract" name="AdditionalLeaseFacilityAreaThroughModificationOfContract" type="num:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="stim_AggregateAreaOfLeaseFacility" name="AggregateAreaOfLeaseFacility" type="num:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="stim_LesseeOperatingLeaseDateOfMaturityMonthAndYear" name="LesseeOperatingLeaseDateOfMaturityMonthAndYear" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LeasesLineItems" name="LeasesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_LeasesTable" name="LeasesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_HeadquartersAndOfficeEquipmentIncludingCopiersMember" name="HeadquartersAndOfficeEquipmentIncludingCopiersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_OfficeEquipmentIncludingCopiersMember" name="OfficeEquipmentIncludingCopiersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_NeuroStarAdvancedTherapySystemsMember" name="NeuroStarAdvancedTherapySystemsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_CashPaidForAmountsIncludedInMeasurementOfLeaseLiabilitiesAbstract" name="CashPaidForAmountsIncludedInMeasurementOfLeaseLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_RightOfUseAssetsObtainedInExchangeForLeaseObligationsAbstract" name="RightOfUseAssetsObtainedInExchangeForLeaseObligationsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_AmortizationPeriodOfDeferredSalesCommissions" name="AmortizationPeriodOfDeferredSalesCommissions" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_AccruedResearchAndDevelopmentExpenseCurrent" name="AccruedResearchAndDevelopmentExpenseCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_TermALoanMember" name="TermALoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TermBLoanMember" name="TermBLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TermCLoanMember" name="TermCLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_LongTermDebtPercentageBearingVariableInterestRateFloor" name="LongTermDebtPercentageBearingVariableInterestRateFloor" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="stim_PercentageOfWarrantIssuedToTrancheBorrowed" name="PercentageOfWarrantIssuedToTrancheBorrowed" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_NotificationPeriodToLendersInOrderToBorrowLoanUponAchievingRequiredRevenueMilestone" name="NotificationPeriodToLendersInOrderToBorrowLoanUponAchievingRequiredRevenueMilestone" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_TrailingTwelveMonthRevenuesToBeAchievedForBorrowingAdditionalAvailabilityUnderLineOfCreditFacility" name="TrailingTwelveMonthRevenuesToBeAchievedForBorrowingAdditionalAvailabilityUnderLineOfCreditFacility" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_LineOfCreditFacilityAdditionalAvailabilityUponAchievementOfTrailingTwelveMonthRevenues" name="LineOfCreditFacilityAdditionalAvailabilityUponAchievementOfTrailingTwelveMonthRevenues" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_LineOfCreditFacilityInterestOnlyPeriod" name="LineOfCreditFacilityInterestOnlyPeriod" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LineOfCreditFacilityAmortizationPeriodWithoutInterestOnlyPeriodExtension" name="LineOfCreditFacilityAmortizationPeriodWithoutInterestOnlyPeriodExtension" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LineOfCreditFacilityInterestOnlyPeriodExtensionPeriodUponAchievementOfRevenues" name="LineOfCreditFacilityInterestOnlyPeriodExtensionPeriodUponAchievementOfRevenues" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LineOfCreditFacilityInterestOnlyPeriodExtensionUponAchievementOfRevenues" name="LineOfCreditFacilityInterestOnlyPeriodExtensionUponAchievementOfRevenues" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LineOfCreditFacilityAmortizationPeriodUponExtensionOfInterestOnlyPeriod" name="LineOfCreditFacilityAmortizationPeriodUponExtensionOfInterestOnlyPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_WarrantsExpirationPeriod" name="WarrantsExpirationPeriod" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LineOfCreditFacilityIncreaseInFinalPaymentFeesPercentageUponExtensionInterestOnlyPeriods" name="LineOfCreditFacilityIncreaseInFinalPaymentFeesPercentageUponExtensionInterestOnlyPeriods" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LineOfCreditFacilityPrepaymentFeesPercentage" name="LineOfCreditFacilityPrepaymentFeesPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LineOfCreditFacilityPercentageOfForecastedRevenueToBeAchievedInFinancialMaintenanceCovenant" name="LineOfCreditFacilityPercentageOfForecastedRevenueToBeAchievedInFinancialMaintenanceCovenant" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_TermALoanAndTermBLoanMember" name="TermALoanAndTermBLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_StockholdersDeficitLineItems" name="StockholdersDeficitLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_StockholdersDeficitTable" name="StockholdersDeficitTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_SharesOfCommonStockReservedForIssuanceAbstract" name="SharesOfCommonStockReservedForIssuanceAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_CommonStockSharesIssuedAndReservedForFutureIssuance" name="CommonStockSharesIssuedAndReservedForFutureIssuance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="stim_CommonStockWarrantsMember" name="CommonStockWarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ExercisePriceRangeOneMember" name="ExercisePriceRangeOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ExercisePriceRangeTwoMember" name="ExercisePriceRangeTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ExercisePriceRangeThreeMember" name="ExercisePriceRangeThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ExercisePriceRangeFourMember" name="ExercisePriceRangeFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ExercisePriceRangeFiveMember" name="ExercisePriceRangeFiveMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ConvertiblePreferredStockWarrantsMember" name="ConvertiblePreferredStockWarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_NonVestedRestrictedStockAwardsMember" name="NonVestedRestrictedStockAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorizedAnnualIncreasePercentage" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorizedAnnualIncreasePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_TwoThousandEighteenEquityIncentivePlanMember" name="TwoThousandEighteenEquityIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_RestrictedStockAndRestrictedStockUnitsRSUMember" name="RestrictedStockAndRestrictedStockUnitsRSUMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedInPeriodWeightedAverageGrantDateFairValueOfUnderlyingCommonStock" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedInPeriodWeightedAverageGrantDateFairValueOfUnderlyingCommonStock" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodOfAutomaticAnnualIncreasesInShareReserve" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodOfAutomaticAnnualIncreasesInShareReserve" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_ReimbursementRevenuePerTreatment" name="ReimbursementRevenuePerTreatment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_UpfrontPaymentMember" name="UpfrontPaymentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_MilestonePaymentMember" name="MilestonePaymentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TeijinPharmaLimitedMember" name="TeijinPharmaLimitedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_DistributionAgreementMember" name="DistributionAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_AgreementExpiryDate" name="AgreementExpiryDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_ExtendedTermOfAgreement" name="ExtendedTermOfAgreement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_RelatedPartyPurchasedPercentageOfSalesForecastsOverAgreementTerm" name="RelatedPartyPurchasedPercentageOfSalesForecastsOverAgreementTerm" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_DistributionAgreementsWithRenewalDescription" name="DistributionAgreementsWithRenewalDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_ProductCategoryMember" name="ProductCategoryMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_NeuroStarAdvancedTherapySystemMember" name="NeuroStarAdvancedTherapySystemMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TreatmentSessionsMember" name="TreatmentSessionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_OtherProductMember" name="OtherProductMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</xsd:schema>
