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        <PersonNm>ROBERT SD HIGGINS MD</PersonNm>
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        <PersonNm>JOSEPH A DEARANI MD</PersonNm>
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        <PersonNm>SEAN C GRONDIN MD</PersonNm>
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        <PersonNm>JOSEPH F SABIK III MD</PersonNm>
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        <PersonNm>THOMAS E MACGILLIVRAY MD</PersonNm>
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        <PersonNm>RICHARD L PRAGER MD</PersonNm>
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        <PersonNm>KEITH S NAUNHEIM MD</PersonNm>
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        <PersonNm>KEVIN D ACCOLA MD</PersonNm>
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        <PersonNm>ANDREW B GOLDSTONE MD</PersonNm>
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        <PersonNm>SHANDA H BLACKMON MD</PersonNm>
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        <PersonNm>HAIQUAN CHEN MD</PersonNm>
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        <PersonNm>JOSEPH C CLEVELAND JR MD</PersonNm>
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        <PersonNm>CHRISTOPHER M DRAFT MD</PersonNm>
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        <PersonNm>BRYAN F MEYERS MD</PersonNm>
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        <PersonNm>DOMENICO PAGANO MD</PersonNm>
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        <PersonNm>VINOD H THOURANI MD</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ARA A VAPORCIYAN MD</PersonNm>
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        <PersonNm>ALAN D SIHOE MD</PersonNm>
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        <PersonNm>MARC RUEL MD</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>LEAH M BACKHUS MD</PersonNm>
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            <CityNm>DURHAM</CityNm>
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      <ContractorCompensationGrp>
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          <BusinessName>
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            <AddressLine1Txt>PO BOX 660613</AddressLine1Txt>
            <CityNm>DALLAS</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
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        <ExplanationTxt>ACCOUNTING PRINCIPLES GENERALLY ACCEPTED IN THE UNITED STATES OF AMERICA REQUIRE MANAGEMENT TO EVALUATE TAX POSITIONS TAKEN BY THE SOCIETY AND RECOGNIZE A TAX LIABILITY IF THE SOCIETY HAS TAKEN AN UNCERTAIN POSITION THAT MORE LIKELY THAN NOT WOULD NOT BE SUSTAINED UPON EXAMINATION BY THE IRS OR OTHER APPLICABLE TAXING AUTHORITIES. MANAGEMENT HAS ANALYZED THE TAX POSITIONS TAKEN BY THE SOCIETY AND HAS CONCLUDED THAT, AS OF DECEMBER 31, 2019, THERE ARE NO UNCERTAIN POSITIONS TAKEN OR EXPECTED TO BE TAKEN THAT WOULD REQUIRE RECOGNITION OF A LIABILITY OR DISCLOSURE IN THE CONSOLIDATED FINANCIAL STATEMENTS.</ExplanationTxt>
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      <GrantsToOrgOutsideUSGrp>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ROBERT WYNBRANDT - PART YEAR</PersonNm>
        <TitleTxt>EXEC DIR &amp; GEN COUNSEL</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>AVIDAN STERN</PersonNm>
        <TitleTxt>ASSOCIATE GENERAL COUNSEL</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KEITH BURA</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DONNA MCDONALD</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>COURTNEY YOHE</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>NATALIE BODEN</PersonNm>
        <TitleTxt>DIR OF MKTG &amp; COMM</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>SCOTT BRADBURY</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>LUIS VARGAS</PersonNm>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>COLLEEN DONOHOE</PersonNm>
        <TitleTxt>DIR OF MTNGS &amp; CONVENTIONS</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>BETH WINER</PersonNm>
        <TitleTxt>EXEC DIR, STSA &amp; TSDA</TitleTxt>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>THERESA LOPEZ</PersonNm>
        <TitleTxt>SR MGR, HUMAN RESOURCES</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>SUSAN BECKER</PersonNm>
        <TitleTxt>SR MGR, STS NATIONAL DATABASE</TitleTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 4B</FormAndLineReferenceDesc>
        <ExplanationTxt>EXECUTIVE DIRECTOR, ELAINE WEISS, PARTICIPATES IN A 457(F) PLAN. THERE WERE NO DISTRIBUTIONS FROM THE PLAN IN 2019.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>AMENDMENT OF ARTICLE III: MEMBERS SECTION 10. LAPSE OF MEMBERSHIP BYLAWS. REDUCE THE AMOUNT OF TIME PROVIDED TO OUR MEMBERS IN ORDER TO PAY THEIR MEMBERSHIP DUES, FROM ONE YEAR TO SIX MONTHS (WHILE STILL RETAINING A SIX-MONTH "REINSTATEMENT" PERIOD). AMENDMENT OF ARTICLE V: BOARD OF DIRECTORS, SECTION 3. NOMINATION, ELECTION, TERM AND DUTIES OF DIRECTORS-AT-LARGE BYLAWS THE AMENDMENT CORRECTS AN INADVERTENT TYPOGRAPHICAL OVERSIGHT WHEN WE ADDED A FOURTH COUNCIL TWO YEARS AGO BUT FAILED TO REFLECT THAT FOURTH COUNCIL IN ONE PARTICULAR SECTION OF OUR BYLAWS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION IS A MEMBERSHIP SOCIETY AND HAS OVER 7,300 MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS OF THE GOVERNING BODY ARE ELECTED BY THE MEMBERSHIP AT ITS ANNUAL MEETING PURSUANT TO THE ORGANIZATION'S BYLAWS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>CERTAIN DECISIONS OF THE GOVERNING BODY (E.G., REGARDING DUES AND BYLAWS AMENDMENTS) ARE SUBJECT TO APPROVAL BY MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION RETAINED THE SERVICES OF AN INDEPENDENT CPA FIRM TO PREPARE ITS FORM 990. MANAGEMENT THEN REVIEWED THE COMPLETED FORM 990 AND PROVIDED A FULL COPY TO ALL VOTING MEMBERS OF THE ORGANIZATION'S BOARD OF DIRECTORS (I.E., THE GOVERNING BODY). THE VOTING MEMBERS OF THE GOVERNING BODY WERE GIVEN A REASONABLE AMOUNT OF TIME TO REVIEW THE RETURN AND ASK ANY QUESTIONS DIRECTLY TO MANAGEMENT OR SENIOR CORPORATE OFFICERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>OFFICERS, DIRECTORS, KEY EMPLOYEES, AND OTHERS ARE ANNUALLY REQUIRED TO COMPLETE A CONFLICT OF INTEREST DISCLOSURE STATEMENT AS A REQUIREMENT OF SERVICE. THE STATEMENT ON STS DISCLOSURE POLICY AND GUIDELINES REGARDING CONFLICTS OF INTEREST IS READ AT THE BEGINNING OF EVERY BOARD OF DIRECTORS, COMMITTEE, COUNCIL OPERATING BOARD, AND WORKFORCE MEETING. IF A CONFLICT OF INTEREST OR THE APPEARANCE OF A CONFLICT OF INTEREST EXISTS, THE PERSON WITH SUCH A CONFLICT MUST DISCLOSE THE RELATIONSHIP AND REFRAIN FROM VOTING ON THE MATTER; IF THE NATURE OF THE RELATIONSHIP SUGGESTS THAT HIS OR HER PRESENCE MAY BE DETRIMENTAL TO THE DISCUSSION, HE OR SHE MUST EXIT THE MEETING. THE MEETING CHAIR MAKES THE FINAL DETERMINATION AS TO THE APPROPRIATE ACTION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>15A. THE SOCIETY ENGAGES AN INDEPENDENT COMPENSATION CONSULTANT PERIODICALLY, USUALLY EVERY TWO OR THREE YEARS, TO PERFORM A MARKET SALARY ANALYSIS FOR THE CEO/EXECUTIVE DIRECTOR POSITION. THIS INFORMATION IS SHARED WITH THE EXECUTIVE COMMITTEE WHICH DETERMINES THE NEW LEVEL OF COMPENSATION AND COMMUNICATES THE SALARY INFORMATION TO THE CEO/EXECUTIVE DIRECTOR AND TO THE DIRECTOR OF FINANCE &amp; ADMINISTRATION FOR IMPLEMENTATION. AN INDEPENDENT COMPENSATION CONSULTANT WAS UTILIZED AS A PART OF THIS PROCESS IN 2018. AN ADJUSTMENT IS MADE TO THE CEO/EXECUTIVE DIRECTOR'S SALARY ANNUALLY FOR A MERIT INCREASE, WHICH IS BASED ON A FORMAL PERFORMANCE EVALUATION. 15B. COMPENSATION - THE SOCIETY ENGAGES AN INDEPENDENT COMPENSATION CONSULTANT PERIODICALLY, USUALLY EVERY TWO OR THREE YEARS, TO PERFORM A MARKET SALARY ANALYSIS FOR STS POSITIONS. THE CONSULTANT MEETS WITH THE CEO/EXECUTIVE DIRECTOR AND EACH STAFF DIRECTOR TO ASCERTAIN INFORMATION RELEVANT TO EACH POSITION. THE CONSULTANT ALSO REVIEWS EACH OF THE POSITION DESCRIPTIONS, DETERMINES APPROPRIATE MATCHES FROM COMPENSATION MARKET SURVEYS, E.G., TOWERS WATSON, PRM, ASSOCIATION FORUM, AND ASAE, FOR COMPARABLE POSITIONS AT SIMILARLY SITUATED ORGANIZATIONS, AND COMPILES AND ANALYZES THIS MARKET DATA FOR EACH POSITION. THE CONSULTANT MEETS WITH THE CEO/EXECUTIVE DIRECTOR AND THE DIRECTOR OF FINANCE &amp; ADMINISTRATION TO REVIEW THE COMPENSATION ANALYSIS, AND MAKES ADJUSTMENTS TO THE ANALYSIS, AS APPROPRIATE. UTILIZING THE CONSULTANT'S ANALYSIS, THE CEO/EXECUTIVE DIRECTOR MAKES SALARY ADJUSTMENTS. AN INDEPENDENT COMPENSATION CONSULTANT WAS UTILIZED AS PART OF THIS PROCESS IN 2018. ADJUSTMENTS ARE MADE TO SALARIES ANNUALLY FOR MERIT INCREASES, WHICH ARE BASED ON FORMAL PERFORMANCE EVALUATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S BYLAWS AND KEY GOVERNANCE POLICIES ARE AVAILABLE TO THE PUBLIC ON THE STS WEBSITE. OTHER GOVERNING DOCUMENTS, AS WELL AS THE ORGANIZATION'S CONFLICT OF INTEREST POLICY AND FINANCIAL STATEMENTS ARE MADE AVAILABLE TO THE PUBLIC UPON WRITTEN REQUEST TO THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>CONSULTANT EXPENSES 938,856. TEMPORARY SERVICES FROM SALARIES 115,577. VOLUNTEER STIPENDS FROM SALARIES 287,500. PAYROLL AND HR FEES 212,887. DATA AUDITING 417,103. DATA WAREHOUSING AND ANALYSIS 6,446,357. WEB-BASED EXPENSES 20,417. VIDEO PRODUCTION 20,390. CTS NET FEES 42,275. MISCELLANEOUS 15,149. TVT EXPENSE 2,909,073.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>CONTRACT LIABILITIES INCREASE DUE TO ADOPTION OF ASU NO. 2014-09 -1,313,237.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>SOCIETY OF THORACIC SURGEONS POLITICAL ACTION COMMITTEE</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>20 F STREET NW SUITE 310C</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20001</ZIPCd>
        </USAddress>
        <EIN>522017375</EIN>
        <PrimaryActivitiesTxt>POLITICAL ACTION COMMITTEE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>527</ExemptCodeSectionTxt>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>THE THORACIC SURGERY FOUNDATION (TSF)</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>633 N ST CLAIR ST SUITE 2100</AddressLine1Txt>
          <CityNm>CHICAGO</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60611</ZIPCd>
        </USAddress>
        <EIN>363635910</EIN>
        <PrimaryActivitiesTxt>RESEARCH AND EDUCATION</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 10</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>THE SOCIETY OF THORACIC SURGEONS</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>1</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>1</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>1</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>1</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>1</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>THE THORACIC SURGERY FOUNDATION</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>B</TransactionTypeTxt>
        <InvolvedAmt>607112</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>CASH PAID</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>THE THORACIC SURGERY FOUNDATION</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>L</TransactionTypeTxt>
        <InvolvedAmt>230048</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ACTUAL COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>