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        <PersonNm>Anil Nanda</PersonNm>
        <TitleTxt>Director-at-Large (until 4/26/17)</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>5.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Regis W Haid Jr</PersonNm>
        <TitleTxt>Director-at-Large (until 4/26/17)</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>5.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>689</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Marc A Vanefsky</PersonNm>
        <TitleTxt>SW Regional Director</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>5.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Gregory R Trost</PersonNm>
        <TitleTxt>NW Regional Director</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>5.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>900</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Charles L Rosen</PersonNm>
        <TitleTxt>SE Regional Director</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>5.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>G Edward Vates</PersonNm>
        <TitleTxt>NE Regional Director</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>5.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Holly S Gilmer</PersonNm>
        <TitleTxt>NW Regional Director (until 4/26/17)</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>5.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Kathleen T Craig</PersonNm>
        <TitleTxt>Executive Director</TitleTxt>
        <AverageHoursPerWeekRt>15.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>50.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>334004</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>37571</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Peter B Kuhn</PersonNm>
        <TitleTxt>Chief Financial Officer</TitleTxt>
        <AverageHoursPerWeekRt>15.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>50.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>171218</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>29948</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Katherine O Orrico</PersonNm>
        <TitleTxt>Washington Office Director</TitleTxt>
        <AverageHoursPerWeekRt>50.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>244872</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>43248</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Anthony P Macalindong</PersonNm>
        <TitleTxt>Information Systems Director</TitleTxt>
        <AverageHoursPerWeekRt>50.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>153652</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>41091</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Joni L Shulman</PersonNm>
        <TitleTxt>Assoc. Executive Director</TitleTxt>
        <AverageHoursPerWeekRt>50.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>150496</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>26320</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Catherine J Hill</PersonNm>
        <TitleTxt>Sen. Manager/Regulatory Affairs</TitleTxt>
        <AverageHoursPerWeekRt>50.00</AverageHoursPerWeekRt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>25708</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Adrienne A Roberts</PersonNm>
        <TitleTxt>Sen. Manager/Legislative Affairs</TitleTxt>
        <AverageHoursPerWeekRt>50.00</AverageHoursPerWeekRt>
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        <ReportableCompFromOrgAmt>134669</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>24353</OtherCompensationAmt>
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      <TotalReportableCompFromOrgAmt>1324219</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>25718</TotReportableCompRltdOrgAmt>
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      <TotalContributionsAmt>497859</TotalContributionsAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>Prof. Development</Desc>
        <BusinessCd>900099</BusinessCd>
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        <Desc>Contracted Service</Desc>
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        <RelatedOrExemptFuncIncomeAmt>266062</RelatedOrExemptFuncIncomeAmt>
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        <Desc>Joint Programs</Desc>
        <BusinessCd>900099</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>152975</RelatedOrExemptFuncIncomeAmt>
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        <ExclusionAmt>1314089</ExclusionAmt>
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        <ExclusionAmt>65239</ExclusionAmt>
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      <LessCostOthBasisSalesExpnssGrp>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>-59180</TotalRevenueColumnAmt>
        <ExclusionAmt>-59180</ExclusionAmt>
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        <UnrelatedBusinessRevenueAmt>706705</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>1320148</ExclusionAmt>
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      <GrantsToDomesticOrgsGrp>
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        <ProgramServicesAmt>49950</ProgramServicesAmt>
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      <GrantsToDomesticIndividualsGrp>
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        <ProgramServicesAmt>163550</ProgramServicesAmt>
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        <TotalAmt>18250</TotalAmt>
        <ProgramServicesAmt>18250</ProgramServicesAmt>
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        <ProgramServicesAmt>919668</ProgramServicesAmt>
        <ManagementAndGeneralAmt>404551</ManagementAndGeneralAmt>
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      <FeesForSrvcInvstMgmntFeesGrp>
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        <ManagementAndGeneralAmt>38390</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>479850</ProgramServicesAmt>
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        <ProgramServicesAmt>494354</ProgramServicesAmt>
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        <ProgramServicesAmt>512493</ProgramServicesAmt>
        <ManagementAndGeneralAmt>225439</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>1728737</ProgramServicesAmt>
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        <ProgramServicesAmt>172845</ProgramServicesAmt>
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        <ProgramServicesAmt>416761</ProgramServicesAmt>
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        <ProgramServicesAmt>88244</ProgramServicesAmt>
        <ManagementAndGeneralAmt>38817</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>11803943</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5092591</ManagementAndGeneralAmt>
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        <EOYAmt>3652859</EOYAmt>
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        <EOYAmt>31367</EOYAmt>
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        <EOYAmt>1122439</EOYAmt>
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        <EOYAmt>19854742</EOYAmt>
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        <EOYAmt>2590148</EOYAmt>
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        <EOYAmt>219136</EOYAmt>
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      <TotalAssetsGrp>
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        <EOYAmt>33833471</EOYAmt>
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        <EOYAmt>3140495</EOYAmt>
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        <EOYAmt>3005470</EOYAmt>
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        <EOYAmt>1846380</EOYAmt>
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        <EOYAmt>7992345</EOYAmt>
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        <EOYAmt>20405738</EOYAmt>
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        <EOYAmt>5041270</EOYAmt>
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        <EOYAmt>394118</EOYAmt>
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        <EOYAmt>25841126</EOYAmt>
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        <EOYAmt>33833471</EOYAmt>
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        <CurrentTaxYearMinus3YearsAmt>816331</CurrentTaxYearMinus3YearsAmt>
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        <CurrentTaxYearAmt>497859</CurrentTaxYearAmt>
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        <CurrentTaxYearAmt>13962463</CurrentTaxYearAmt>
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        <CurrentTaxYearMinus3YearsAmt>12973596</CurrentTaxYearMinus3YearsAmt>
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        <CurrentTaxYearAmt>14460322</CurrentTaxYearAmt>
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        <GrantTypeTxt>Mahaley Clinical Award</GrantTypeTxt>
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        <ExplanationTxt>All Members of the American Association of Neurological Surgeons (AANS) shall be considered Members of American Association of Neurosurgeons (AAN). The Members elected to the AANS shall be divided into eleven classes: 1) Fellow 2) Provisional 3) International 4) Associate 5) Allied 6) Lifetime 7) Resident/Candidate 8) International Candidate 9) Honorary 10) Affiliate 11) Student Only Fellows, Provisional, and Lifetime Members may vote. Only Fellows may hold office.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>The Executive Director's annual compensation is subject to the provisions in their employment contract: the Executive shall receive a base salary, paid in accordance with the Association's normal payroll practices. Effective as of January 1, 2016, the Executive's base salary shall be at an annual rate of $325,000, and shall increase three percent (3%) on January 1st of each year. In addition, during the period of November 1, 2018 through December 31, 2018, the Association and the Executives agree to meet in good faith to renegotiate the Executive's base salary to determine any other appropriate increase. The Association may award the Executive bonuses in such amounts and at such times as the Association's Review Committee, in his or her sole discretion, deems appropriate. This process is documented. Compensation for the CFO and Associate Executive Directors is determined by the Executive Director (ED). The ED's basis for determining compensation is based on market data including the Association Forum of Chicagoland.</ExplanationTxt>
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        <ExplanationTxt>The organization makes its governing documents, conflict of interest policy and financial statements available to the public upon request for the same period of disclosure as set forth in IRC Section 6104(d).</ExplanationTxt>
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        <ExplanationTxt>Transfer from American Association of Neurological Surgeons, Inc. 1,136,703. Transfer to American Association of Neurological Surgeons, Inc. -130,000.</ExplanationTxt>
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