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        <ExclusionAmt>58886</ExclusionAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>59997</ExclusionAmt>
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        <Desc>Miscellaneous</Desc>
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        <EOYAmt>521628</EOYAmt>
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        <EOYAmt>2737908</EOYAmt>
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      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>Management evaluated the Organization's tax positions and concluded that the Organization's financial statements do not include any uncertain tax positions.</ExplanationTxt>
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        <PersonNm>Tracy Lofty</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>James Youngblood</PersonNm>
        <TitleTxt>CEO through May 2019</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>835665</CompensationBasedOnRltdOrgsAmt>
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        <DeferredCompRltdOrgsAmt>138073</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>17109</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>1111542</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>353724</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>G Alan Stiles</PersonNm>
        <TitleTxt>COO through February 2019</TitleTxt>
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        <TotalCompensationFilingOrgAmt>3396</TotalCompensationFilingOrgAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 4b</FormAndLineReferenceDesc>
        <ExplanationTxt>Persons that participated in, or received payment from a nonqualified retirement plan: During the 2018 calendar year, the Society contributed $63,233 to James Youngblood's nonqualified Section 457(f) plan. The deferrals were not substantially vested at December 31, 2018. As such, the amounts are included as deferred compensation on the 2018 Form 990. James Youngblood received a 457(f) payout in the amount of $353,723.87 in February 2018 that was included in his 2018 W-2. This amount has been reported in Schedule J, Part II, Column (F).</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>Each year, new Directors are determined through a slate of candidates assembled by the Board of Directors. The number of candidates shall equal the number of available seats and an equal number of alternates. The selected slate of candidates is submitted to the Heart Rhythm Society Board of Trustees for approval by a majority vote at the time of its annual meeting. However, this HRS Board review and approval of the slated candidates does not correlate to any element of HRS' control over the organization.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Form 990 is prepared by an independent accounting firm, and a draft is submitted to the HRS financial team for review. Following the HRS financial team review of tax forms, the Form 990 and other forms as necessary are reviewed by IBHRE's Executive Director. IBHRE's Executive Director informs the HRS financial team of the necessary revisions. After revisions are made by the HRS financial team, the forms are forwarded to the IBHRE Board of Directors by the IBHRE Executive Director prior to filing with the IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>The Board President reviews all Board and Committee member disclosure forms. Before the start of every meeting, a statement regarding disclosures and conflict of interest is read by the Board President.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation of key (and non-key) employees are reviewed as part of the overall budget approval process by the Heart Rhythm Society Finance Committee and Board of Trustees. The salary of each staff position is reviewed and determined using internally obtained survey data.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization's governing documents and conflict of interest policy are publicly available on the Organization's website. Audited financial statements are available upon request to individuals and organizations based on business need.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>Content Development 570,675. Honoraria Fees 33,750. Commissions 16,773. Consulting Services 5,247. Copyright, Patent &amp; Trademark Fees 2,152. Graphics Design 1,751. Decorator 1,194. Placement Fees 780. Payroll Processing 556. Royalty Fees 540. Security 351. Evaluation Processing 63.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XII, Line 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>No change from the prior year.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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          <BusinessNameLine1Txt>Heart Rhythm Society Inc</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>1325 G Street NW Suite 400</AddressLine1Txt>
          <CityNm>Washington</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>200053121</ZIPCd>
        </USAddress>
        <EIN>042694458</EIN>
        <PrimaryActivitiesTxt>To enhance the prevention and treatment of cardiac rhythm disorders.</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>Line 10</PublicCharityStatusTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</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>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>1</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>1</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
  </ReturnData>
</Return>