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        <PersonNm>Rupa Sanghani</PersonNm>
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        <PersonNm>Nishant Shah</PersonNm>
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        <PersonNm>Suman Tandon</PersonNm>
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        <PersonNm>Viviany Taqueti</PersonNm>
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        <PersonNm>David Winchester</PersonNm>
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        <PersonNm>Michelle L Klinke</PersonNm>
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        <PersonNm>Jennifer Taylor Howell</PersonNm>
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        <CurrentTaxYearMinus3YearsAmt>50</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus1YearAmt>169</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>283</CurrentTaxYearAmt>
        <TotalAmt>11605</TotalAmt>
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      <TotalSupportCalendarYearGrp>
        <CurrentTaxYearMinus4YearsAmt>4388998</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>3510909</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>3919387</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>4244498</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>5234003</CurrentTaxYearAmt>
        <TotalAmt>21297795</TotalAmt>
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      <PublicSupportCY509Pct>0.71950</PublicSupportCY509Pct>
      <PublicSupportPY509Pct>0.71170</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.22000</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.19440</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
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      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
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        <DepreciationAmt>182604</DepreciationAmt>
        <BookValueAmt>134551</BookValueAmt>
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      <EquipmentGrp>
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        <DepreciationAmt>58718</DepreciationAmt>
        <BookValueAmt>4202</BookValueAmt>
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      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>85590</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>67088</DepreciationAmt>
        <BookValueAmt>18502</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>157255</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>Refundable Deposits</Desc>
        <BookValueAmt>44800</BookValueAmt>
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      <OtherAssetsOrgGrp>
        <Desc>Right of Use Asset- Opearting Lease</Desc>
        <BookValueAmt>493178</BookValueAmt>
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      <OtherAssetsOrgGrp>
        <Desc>Right of Use Asset- Finance Lease</Desc>
        <BookValueAmt>16765</BookValueAmt>
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        <Desc>Pension Liabilities</Desc>
        <Amt>547214</Amt>
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      <OtherLiabilitiesOrgGrp>
        <Desc>Lease Liabilites - Operating Lease</Desc>
        <Amt>753688</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>Lease Liabilites -Finance Lease</Desc>
        <Amt>17064</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>1317966</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>4865541</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>279046</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>279046</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>4586495</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>4586495</TotalRevenuePerForm990Amt>
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      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>3920278</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>3920278</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Society evaluates uncertainty in income tax positions based on a more-likely-than-not recognition standard. If that threshold is met, the tax position is then measured at the largest amount that is greater than 50% likely of being realized upon ultimate settlement and is recognized in the Society's financial statements. As of December 31, 2024 and 2023, there are no accruals for uncertain tax positions. If applicable, the Society records interest and penalties as a component of income tax expense. Tax years from 2021 through the current year remain open for examination by federal and state tax authorities.</ExplanationTxt>
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    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Young Investigator Award/Dr. Jamilah Al-Harbi Ottawa Heart Institute</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>35000</CashGrantAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>The ASNC/Pfizer Young Investiator in Cardiac Amyloidosis Research Fellowship Award provides $35,000 in support to eligible investigators for a mentored research project exploring the role of nuclear cardiology in the early detection of TTR cardiac amyloidosis. The recipient will present their research at the ASNC Annual Meeting in September.</ExplanationTxt>
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    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <Form990OfOtherOrganizationsInd>X</Form990OfOtherOrganizationsInd>
      <WrittenEmploymentContractInd>X</WrittenEmploymentContractInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>1</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Kathleen B Flood</PersonNm>
        <TitleTxt>Chief Executive Officer</TitleTxt>
        <BaseCompensationFilingOrgAmt>393167</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>40000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>38500</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>471667</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Michelle L Klinke</PersonNm>
        <TitleTxt>Program Director</TitleTxt>
        <BaseCompensationFilingOrgAmt>189318</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>5000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>18932</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 4b</FormAndLineReferenceDesc>
        <ExplanationTxt>KATHLEEN FLOOD 457(B) PLAN CONTRIBUTION FOR 2021 WAS $34,952.</ExplanationTxt>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>Organization member categories are regular members consisting of full physician members and affiliate members; Technologist Members; Associate Members; Emeritus Members; Honorary Members. The members are approved through a process of submitting applications and approval by the society.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>During an annual business meeting, officers of the society are elected by the members of the society and only full members are allowed to vote on matters affecting the society. Nominations of officers are submitted to the membership by a nominating committee.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>Workpapers to support the Form 990 are prepared by the accounting staff of the society. The information is forwarded to the independent accountants for preparation. Any areas of concern are brought to the attention of the society officers (Executive Council) for review. The final Form 990 is reviewed by accounting staff of the society and signed by the CEO prior to filing. It is available, upon request, to any member of the board of directors.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>A key element in monitoring relevant conflicts of interest is a system of annual disclosure. The society requires disclosure from board members, executive council and committee members, meeting speakers and planners. Disclosure forms are reviewed by executive council or committees, and decisions regarding conflicts of interest are made by committee or executive council. Failure to file disclosure can disqualify a person from participating in an activity, either as a planner or a speaker, or participation on a committee or board. Education activities include a survey evaluating possible bias, which are reviewed and acted on.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>The officers of the society (Executive Council) review outside independent compensation information as a part of the contract review for the CEO's compensation. Information review includes compensation for other executive directors in comparably sized medical societies. This information is obtained from a review of the Form 990 of those societies. In addition, salary surveys are reviewed from professional organizations that represent the non-profit association field. Annually, the CEO reviews salary surveys from other professional organizations in the Washington, DC area to determine if other key employees are fairly compensated.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Articles of incorporation, bylaws, and IRS determination documents are made available on the website of the society. Financial statements are provided upon request.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>Professional Fees: Program service expenses 482,476. Management and general expenses 260,151. Fundraising expenses 23,663. Total expenses 766,290.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XII, Line 2C</FormAndLineReferenceDesc>
        <ExplanationTxt>The audit oversight process has remained unchanged from the previous year.</ExplanationTxt>
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