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        <PersonNm>KEVIN DICKEY MD FSIR</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MERIDITH ENGLANDER</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>KELVIN HONG MD FSIR</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>KATHARINE KROL MD FSIR</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ROBERT LEWANDOWSKI</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>RAYMOND W LIU MD FSIR</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DEREK MITTLEIDER MD FSIR</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>RAJ PYNE MD FSIR</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>AKHI SISTA MD FSIR</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BRIAN F STAINKEN MD FSIR</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CONSTANTINOS T SOFOCLEOUS MD PHD</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>RAJ SHAH MD</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SAHER S SABRI MD FSIR</PersonNm>
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        <ContractorAddress>
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            <StateAbbreviationCd>VA</StateAbbreviationCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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          <USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>PERSONIFY INC</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
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            <CityNm>VIENNA</CityNm>
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          </USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>4445 WILLARD AVE SUITE 600</AddressLine1Txt>
            <CityNm>CHEVY CHASE</CityNm>
            <StateAbbreviationCd>MD</StateAbbreviationCd>
            <ZIPCd>20815</ZIPCd>
          </USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>THE REIS GROUP</BusinessNameLine1Txt>
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        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1300 19TH ST SUITE 600</AddressLine1Txt>
            <CityNm>WASHINGTON</CityNm>
            <StateAbbreviationCd>DC</StateAbbreviationCd>
            <ZIPCd>20036</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>PUBLIC RELATIONS CONSULTATION/SUPPORT</ServicesDesc>
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      <CntrctRcvdGreaterThan100KCnt>8</CntrctRcvdGreaterThan100KCnt>
      <GovernmentGrantsAmt>729832</GovernmentGrantsAmt>
      <TotalContributionsAmt>729832</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>MEMBERSHIP DUES</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>3456290</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>3456290</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>SPONSORSHIPS</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>1557750</TotalRevenueColumnAmt>
        <ExclusionAmt>1557750</ExclusionAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>PRODUCTS &amp; PUBLICATION</Desc>
        <BusinessCd>900099</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>1089456</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>ANNUAL MEETING</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>1084671</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1048921</RelatedOrExemptFuncIncomeAmt>
        <ExclusionAmt>35750</ExclusionAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>MANAGEMENT FEES</Desc>
        <BusinessCd>561000</BusinessCd>
        <TotalRevenueColumnAmt>795000</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>795000</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalOthProgramServiceRevGrp>
        <TotalRevenueColumnAmt>1095263</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>617516</RelatedOrExemptFuncIncomeAmt>
        <ExclusionAmt>477747</ExclusionAmt>
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        <ExclusionAmt>726699</ExclusionAmt>
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        <SecuritiesAmt>7681</SecuritiesAmt>
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        <TotalRevenueColumnAmt>7681</TotalRevenueColumnAmt>
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      <OtherRevenueMiscGrp>
        <Desc>JOB BOARD REVENUE</Desc>
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      <OtherRevenueMiscGrp>
        <Desc>LICENSING FEE</Desc>
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        <ExclusionAmt>30000</ExclusionAmt>
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      <GrantsToDomesticOrgsGrp>
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          <BusinessNameLine1Txt>SOCIETY OF INTERVENTIONAL RADIOLOGY PAC</BusinessNameLine1Txt>
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          <AddressLine1Txt>3975 FAIR RIDGE DRIVE SUITE 400N</AddressLine1Txt>
          <CityNm>FAIRFAX</CityNm>
          <StateAbbreviationCd>VA</StateAbbreviationCd>
          <ZIPCd>22033</ZIPCd>
        </USAddress>
        <EIN>203974267</EIN>
        <ContributionsRcvdDlvrAmt>35107</ContributionsRcvdDlvrAmt>
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      <SubstantiallyAllDuesNondedInd>0</SubstantiallyAllDuesNondedInd>
      <OnlyInHouseLobbyingInd>0</OnlyInHouseLobbyingInd>
      <AgreeCarryoverPriorYearInd>1</AgreeCarryoverPriorYearInd>
      <DuesAssessmentsAmt>3456290</DuesAssessmentsAmt>
      <NonDeductibleLbbyngPltclCYAmt>118782</NonDeductibleLbbyngPltclCYAmt>
      <NonDedLbbyngPltclCyovAmt>276872</NonDedLbbyngPltclCyovAmt>
      <NonDeductibleLbbyngPltclTotAmt>395654</NonDeductibleLbbyngPltclTotAmt>
      <AggregateReportedDuesNtcAmt>69126</AggregateReportedDuesNtcAmt>
      <CarriedOverAmt>326528</CarriedOverAmt>
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        <FormAndLineReferenceDesc>PART I-A, LINE 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>SIR DOES NOT PARTICIPATE IN POLITICAL ACTIVITIES. HOWEVER, SIR ESTABLISHED THE SIR POLITICAL ACTION COMMITTEE (SIR-PAC) SO THAT SIR'S MEMBERS CAN BRING THEIR CONCERNS TO THE ATTENTION OF VARIOUS MEMBERS OF CONGRESS. THE PAC ALSO HELPS EDUCATE THE LEGISLATURE OF THE VALUE AND IMPORTANCE OF INTERVENTIONAL RADIOLOGY AS IT RELATES TO PATIENT CARE.</ExplanationTxt>
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    </IRS990ScheduleC>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>596009</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>535580</DepreciationAmt>
        <BookValueAmt>60429</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>702560</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>592634</DepreciationAmt>
        <BookValueAmt>109926</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>2300850</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>2172967</DepreciationAmt>
        <BookValueAmt>127883</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>298238</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>DUE FROM THE SIR FOUNDATION</Desc>
        <BookValueAmt>1252471</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>SECURITY DEPOSITS</Desc>
        <BookValueAmt>27869</BookValueAmt>
      </OtherAssetsOrgGrp>
      <TotalBookValueOtherAssetsAmt>1280340</TotalBookValueOtherAssetsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>DEFERRED RENT AND LEASE INCENTIVES</Desc>
        <Amt>98629</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>DEFERRED COMPENSATION PLAN LIABILITY</Desc>
        <Amt>43671</Amt>
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      <TotalLiabilityAmt>142300</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>SIR EVALUATED ITS UNCERTAINTY IN INCOME TAXES FOR THE YEARS ENDED DECEMBER 31, 2021 AND 2020 AND DETERMINED THAT THERE WERE NO MATTERS THAT WOULD REQUIRE RECOGNITION IN THE CONSOLIDATED FINANCIAL STATEMENTS OR THAT MAY HAVE ANY EFFECT ON ITS TAX-EXEMPT STATUS.</ExplanationTxt>
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      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <RecipientTable>
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          <BusinessNameLine1Txt>SOCIETY OF INTERVENTIONAL RADIOLOGY FOUNDATION</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>3975 FAIR RIDGE DRIVE SUITE 400N</AddressLine1Txt>
          <CityNm>FAIRFAX</CityNm>
          <StateAbbreviationCd>VA</StateAbbreviationCd>
          <ZIPCd>22033</ZIPCd>
        </USAddress>
        <RecipientEIN>541518252</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>225000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>GENERAL SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>1</Total501c3OrgCnt>
      <TotalOtherOrgCnt>0</TotalOtherOrgCnt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>SIR WILL MAKE CHARITABLE DONATIONS TO THE SOCIETY OF INTERVENTIONAL RADIOLOGY FOUNDATION (SIR FOUNDATION), A RELATED ORGANIZATION EXEMPT UNDER SECTION 501(C)(3). THE DONATION EACH YEAR IS CONTINGENT UPON THE SIR'S EXECUTIVE COMMITTEE APPROVAL DURING THE BUDGET PROCESS. SIR ACKNOWLEDGES THAT THE SIR FOUNDATION PROMISES TO USE THE AMOUNT DONATED FOR THE PURPOSES SPECIFIED AND WILL CONSTITUTE FULL AND ADEQUATE CONSIDERATION FOR THE DONATION. SIR DOES NOT TYPICALLY AWARD OUTSIDE GRANTS TO OTHER ORGANIZATIONS. ON OCCASION A CONTRIBUTION MAY BE GRANTED TO SUPPORT THAT ORGANIZATION'S MISSION. NO ADDITIONAL REQUESTS ARE MADE AFTER THE FUNDS ARE DISTRIBUTED.</ExplanationTxt>
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      <WrittenEmploymentContractInd>X</WrittenEmploymentContractInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
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      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KEITH HUME</PersonNm>
        <TitleTxt>EXECUTIVE DIRECTOR</TitleTxt>
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        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>23200</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>346075</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>CAROLYN STRAIN MA MS</PersonNm>
        <TitleTxt>ASSISTANT ED</TitleTxt>
        <BaseCompensationFilingOrgAmt>134963</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>1734</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>11465</DeferredCompensationFlngOrgAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>SIR IS A MEMBERSHIP BASED ORGANIZATION WITH APPROXIMATELY 5,000+ MEMBERS WHO ARE INVOLVED WITH INTERVENTIONAL RADIOLOGY. ACTIVE MEMBERS AND FELLOWS HAVE VOTING RIGHTS ON GOVERNING DECISIONS OF SIR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>ACTIVE MEMBERS AND FELLOWS OF SIR HAVE THE RIGHT TO VOTE FOR THE ELECTION OF OFFICERS AND OTHER MEMBERS OF THE EXECUTIVE COUNCIL.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>ACTIVE MEMBERS AND FELLOWS' RIGHTS TO VOTE INCLUDE THE APPROVAL OF MEMBERSHIP DUES AND ASSESSMENTS, THE AMENDMENTS TO THE BYLAWS, AND SIR'S ARTICLES OF INCORPORATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>SIR HIRES AN INDEPENDENT ACCOUNTING FIRM TO PREPARE THE FEDERAL FORM 990. UPON RECEIPT OF THE DRAFT FORM 990, IT IS REVIEWED BY THE EXECUTIVE DIRECTOR AND SENIOR DIRECTOR OF FINANCE. A COPY OF THE DRAFT FORM 990 IS THEN SENT TO THE BOARD OF DIRECTORS VIA E-MAIL. A PERIOD OF A FEW DAYS IS GIVEN TO THE BOARD MEMBERS TO ADDRESS ANY CONCERNS THAT THEY MAY HAVE BEFORE THE FEDERAL FORM 990 IS FILED WITH THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SIR EXECUTIVE COUNCIL (EC) AND FOUNDATION BOARD OF DIRECTORS ARE REQUIRED TO UPDATE A CONFLICT OF INTEREST FORM PRIOR TO MEETINGS OF THE EC AND BOARD MEETINGS AS NECESSARY. A CONFLICT OF INTEREST FORM IS DISTRIBUTED ELECTRONICALLY TO ALL OF THE OFFICERS, MEMBERS, INVITED GUESTS AND KEY EMPLOYEES FOR UPDATING AND THEIR SIGNATURE TO REPORT ALL POTENTIAL CONFLICTS OF INTERESTS. AT ANY MEETING OR OCCASION, A SUMMARY OF ALL REPORTED CONFLICTS OF INTEREST ARE INCLUDED IN THE MEETING MATERIALS. OFFICERS, MEMBERS OR STAFF WITH PERCEIVED OR REAL CONFLICTS OF INTEREST MAY NOT BE PERMITTED TO VOTE ON AN ACTION OR PARTICIPATE IN DISCUSSION WHERE THEY HAVE A CONFLICT OF INTEREST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>AN OUTSIDE FIRM DOES A MARKET COMPARISON SURVEY BY JOB DESCRIPTION, FIELD (MEDICAL ASSOCIATION), REGION, AND SIZE OF ORGANIZATION AS COMPARISONS. THIS SURVEY IS SHARED WITH THE FINANCE COMMITTEE AND EXECUTIVE COUNCIL. THE EXECUTIVE DIRECTOR COMPENSATION IS ALSO INCLUDED TO INCLUDE A LOOK AT BONUS COMPARISONS AS WELL AS FRINGE BENEFITS. THE EXECUTIVE COMMITTEE DOES A REVIEW WITH THE EXECUTIVE DIRECTOR ANNUALLY. THE LAST COMPENSATION REVIEW CONDUCTED FOR THE EXECUTIVE DIRECTOR WAS OCTOBER 2020.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS ARE MADE AVAILABLE UPON REQUEST VIA EMAIL LINK ON SIR'S WEBSITE OR BY PHONE CALL TO THE CORPORATE OFFICE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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        <DisregardedEntityName>
          <BusinessNameLine1Txt>SOCIETY OF INTERVENTIONAL RADIOLOGY FOUNDATION</BusinessNameLine1Txt>
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          <AddressLine1Txt>3975 FAIR RIDGE DRIVE SUITE 400N</AddressLine1Txt>
          <CityNm>FAIRFAX</CityNm>
          <StateAbbreviationCd>VA</StateAbbreviationCd>
          <ZIPCd>22033</ZIPCd>
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        <PrimaryActivitiesTxt>RESEARCH AND SUPPORT OF INTERVENTIONAL RADIOLOGY</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 12A, I</PublicCharityStatusTxt>
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          <BusinessNameLine1Txt>SOCIETY OF INTERVENTIONAL RADIOLOGY</BusinessNameLine1Txt>
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      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>SOCIETY OF INTERVENTIONAL RADIOLOGY PAC</BusinessNameLine1Txt>
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          <CityNm>FAIRFAX</CityNm>
          <StateAbbreviationCd>VA</StateAbbreviationCd>
          <ZIPCd>22033</ZIPCd>
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        <PrimaryActivitiesTxt>POLITICAL ACTION COMMITTEE</PrimaryActivitiesTxt>
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        <DirectControllingEntityName>
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