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      <ProgramServiceRevenue>
        <Description>VERIFICATION LETTERS</Description>
        <BusinessCode>900099</BusinessCode>
        <TotalRevenueColumn>5980</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>5980</RelatedOrExemptFunctionIncome>
      </ProgramServiceRevenue>
      <TotalProgramServiceRevenue>6216505</TotalProgramServiceRevenue>
      <InvestmentIncome>
        <TotalRevenueColumn>576558</TotalRevenueColumn>
        <ExclusionAmount>576558</ExclusionAmount>
      </InvestmentIncome>
      <GrossRents>
        <Real>132177</Real>
      </GrossRents>
      <LessRentalExpenses>
        <Real>0</Real>
      </LessRentalExpenses>
      <RentalIncomeOrLoss>
        <Real>132177</Real>
      </RentalIncomeOrLoss>
      <NetRentalIncomeOrLoss>
        <TotalRevenueColumn>132177</TotalRevenueColumn>
        <ExclusionAmount>132177</ExclusionAmount>
      </NetRentalIncomeOrLoss>
      <GrossAmountSalesAssets>
        <Securities>5418321</Securities>
        <Other>104700</Other>
      </GrossAmountSalesAssets>
      <LessCostOthBasisSalesExpenses>
        <Securities>4478412</Securities>
        <Other>117880</Other>
      </LessCostOthBasisSalesExpenses>
      <GainOrLoss>
        <Securities>939909</Securities>
        <Other>-13180</Other>
      </GainOrLoss>
      <NetGainOrLossInvestments>
        <TotalRevenueColumn>926729</TotalRevenueColumn>
        <ExclusionAmount>926729</ExclusionAmount>
      </NetGainOrLossInvestments>
      <TotalRevenue>
        <TotalRevenueColumn>7851969</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>6216505</RelatedOrExemptFunctionIncome>
        <UnrelatedBusinessRevenue>0</UnrelatedBusinessRevenue>
        <ExclusionAmount>1635464</ExclusionAmount>
      </TotalRevenue>
      <CompCurrentOfficersDirectors>
        <Total>462872</Total>
      </CompCurrentOfficersDirectors>
      <OtherSalariesAndWages>
        <Total>620813</Total>
      </OtherSalariesAndWages>
      <PensionPlanContributions>
        <Total>186409</Total>
      </PensionPlanContributions>
      <OtherEmployeeBenefits>
        <Total>236497</Total>
      </OtherEmployeeBenefits>
      <PayrollTaxes>
        <Total>66675</Total>
      </PayrollTaxes>
      <FeesForServicesLegal>
        <Total>151700</Total>
      </FeesForServicesLegal>
      <FeesForServicesAccounting>
        <Total>31867</Total>
      </FeesForServicesAccounting>
      <FeesForServicesInvstMgmntFees>
        <Total>103033</Total>
      </FeesForServicesInvstMgmntFees>
      <FeesForServicesOther>
        <Total>484779</Total>
      </FeesForServicesOther>
      <OfficeExpenses>
        <Total>217938</Total>
      </OfficeExpenses>
      <Occupancy>
        <Total>40982</Total>
      </Occupancy>
      <Travel>
        <Total>117485</Total>
      </Travel>
      <ConferencesMeetings>
        <Total>880861</Total>
      </ConferencesMeetings>
      <DepreciationDepletion>
        <Total>270257</Total>
      </DepreciationDepletion>
      <Insurance>
        <Total>91530</Total>
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      <OtherExpenses>
        <Description>NBME CONTRACT</Description>
        <Total>1036146</Total>
      </OtherExpenses>
      <OtherExpenses>
        <Description>EXAMINERS</Description>
        <Total>324987</Total>
      </OtherExpenses>
      <OtherExpenses>
        <Description>SCRIBE SUPPORT</Description>
        <Total>321042</Total>
      </OtherExpenses>
      <OtherExpenses>
        <Description>SITE EXPENSE</Description>
        <Total>267214</Total>
      </OtherExpenses>
      <AllOtherExpenses>
        <Total>601626</Total>
      </AllOtherExpenses>
      <TotalFunctionalExpenses>
        <Total>6514713</Total>
      </TotalFunctionalExpenses>
      <CashNonInterestBearing>
        <BOY>2755042</BOY>
        <EOY>3244872</EOY>
      </CashNonInterestBearing>
      <InventoriesForSaleOrUse>
        <BOY>2112</BOY>
        <EOY>168</EOY>
      </InventoriesForSaleOrUse>
      <PrepaidExpensesDeferredCharges>
        <BOY>321365</BOY>
        <EOY>195771</EOY>
      </PrepaidExpensesDeferredCharges>
      <LandBuildingsEquipmentBasis>4287478</LandBuildingsEquipmentBasis>
      <LandBldgEquipmentAccumDeprec>2293610</LandBldgEquipmentAccumDeprec>
      <LandBuildingsEquipmentBasisNet>
        <BOY>1956247</BOY>
        <EOY>1993868</EOY>
      </LandBuildingsEquipmentBasisNet>
      <InvestmentsPubTradedSecurities>
        <BOY>19714227</BOY>
        <EOY>22107606</EOY>
      </InvestmentsPubTradedSecurities>
      <InvestmentsOtherSecurities>
        <BOY>48429</BOY>
        <EOY>68757</EOY>
      </InvestmentsOtherSecurities>
      <OtherAssetsTotal>
        <BOY>64295</BOY>
        <EOY>79062</EOY>
      </OtherAssetsTotal>
      <TotalAssets>
        <BOY>24861717</BOY>
        <EOY>27690104</EOY>
      </TotalAssets>
      <AccountsPayableAccruedExpenses>
        <BOY>763099</BOY>
        <EOY>1818220</EOY>
      </AccountsPayableAccruedExpenses>
      <DeferredRevenue>
        <BOY>721950</BOY>
        <EOY>530100</EOY>
      </DeferredRevenue>
      <OtherLiabilities>
        <BOY>51754</BOY>
        <EOY>84851</EOY>
      </OtherLiabilities>
      <TotalLiabilities>
        <BOY>1536803</BOY>
        <EOY>2433171</EOY>
      </TotalLiabilities>
      <FollowSFAS117>X</FollowSFAS117>
      <UnrestrictedNetAssets>
        <BOY>23324914</BOY>
        <EOY>25256933</EOY>
      </UnrestrictedNetAssets>
      <TotalNetAssetsFundBalances>
        <BOY>23324914</BOY>
        <EOY>25256933</EOY>
      </TotalNetAssetsFundBalances>
      <TotalLiabNetAssetsFundBalances>
        <BOY>24861717</BOY>
        <EOY>27690104</EOY>
      </TotalLiabNetAssetsFundBalances>
      <InfoInScheduleOPartXI>X</InfoInScheduleOPartXI>
      <ReconcilationRevenueExpenses>1337256</ReconcilationRevenueExpenses>
      <ReconcilationOtherChanges>594763</ReconcilationOtherChanges>
      <MethodOfAccountingAccrual>X</MethodOfAccountingAccrual>
      <AccountantCompileOrReview>0</AccountantCompileOrReview>
      <FSAudited>1</FSAudited>
      <AuditCommittee>1</AuditCommittee>
      <FinancialStatementSeparate>X</FinancialStatementSeparate>
      <FederalGrantAuditRequired>0</FederalGrantAuditRequired>
    </IRS990>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <Land>
        <OtherCostOrOtherBasis>235412</OtherCostOrOtherBasis>
        <BookValue>235412</BookValue>
      </Land>
      <Buildings>
        <OtherCostOrOtherBasis>2408775</OtherCostOrOtherBasis>
        <Depreciation>1271658</Depreciation>
        <BookValue>1137117</BookValue>
      </Buildings>
      <Equipment>
        <OtherCostOrOtherBasis>594073</OtherCostOrOtherBasis>
        <Depreciation>268568</Depreciation>
        <BookValue>325505</BookValue>
      </Equipment>
      <OtherLandBuildings>
        <OtherCostOrOtherBasis>1049218</OtherCostOrOtherBasis>
        <Depreciation>753384</Depreciation>
        <BookValue>295834</BookValue>
      </OtherLandBuildings>
      <TotalOfBookValueLandBuildings>1993868</TotalOfBookValueLandBuildings>
      <OtherLiabilities>
        <Description>DEPOSITS</Description>
        <Amount>16094</Amount>
      </OtherLiabilities>
      <OtherLiabilities>
        <Description>DEFERRED COMPENSATION</Description>
        <Amount>68757</Amount>
      </OtherLiabilities>
      <TotalOfAmounts>84851</TotalOfAmounts>
      <TotalRevenue>7851969</TotalRevenue>
      <TotalExpenses>6514713</TotalExpenses>
      <ExcessOrDeficitForYear>1337256</ExcessOrDeficitForYear>
      <NetUnrealizedGLOnInvestments>594763</NetUnrealizedGLOnInvestments>
      <TotalAdjustments>594763</TotalAdjustments>
      <ExcessOrDeficitPerFS>1932019</ExcessOrDeficitPerFS>
      <TotRevenueEtcAuditedFinclStmt>13131699</TotRevenueEtcAuditedFinclStmt>
      <NetUnrealizedGainsInvestments>594763</NetUnrealizedGainsInvestments>
      <DonatedSrvcAndUseOfFacilities>4788000</DonatedSrvcAndUseOfFacilities>
      <RevenueNotRptdF990>5382763</RevenueNotRptdF990>
      <RevenueSubtotal>7748936</RevenueSubtotal>
      <InvestmentExpensesNotIncluded>103033</InvestmentExpensesNotIncluded>
      <RevenueNotRptdOnFinStmt>103033</RevenueNotRptdOnFinStmt>
      <TotalRevenuePerForm990>7851969</TotalRevenuePerForm990>
      <TotExpensesEtcAuditedFinclStmt>11199680</TotExpensesEtcAuditedFinclStmt>
      <DonatedServicesUseOfFacilities>4788000</DonatedServicesUseOfFacilities>
      <ExpensesNotRptdF990>4788000</ExpensesNotRptdF990>
      <ExpensesSubtotal>6411680</ExpensesSubtotal>
      <InvestmentExpensesNotIncluded2>103033</InvestmentExpensesNotIncluded2>
      <ExpensesNotRptdOnFinStmt>103033</ExpensesNotRptdOnFinStmt>
      <TotalExpensesPerForm990>6514713</TotalExpensesPerForm990>
      <Form990ScheduleDPartXIV>
        <Identifier>DESCRIPTION OF UNCERTAIN TAX POSITIONS UNDER FIN 48:</Identifier>
        <ReturnReference>PART X:</ReturnReference>
        <Explanation>THE ORGANIZATION ADOPTED A POLICY THAT CLARIFIES THE ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES RECOGNIZED IN AN ENTITY'S FINANCIAL STATEMENTS. THE POLICY PRESCRIBES A RECOGNITION THRESHOLD AND MEASUREMENT PRINCIPLES FOR THE FINANCIAL STATEMENT RECOGNITION AND MEASUREMENT OF TAX POSITIONS TAKEN OR EXPECTED TO BE TAKEN ON A TAX RETURN THAT ARE NOT CERTAIN TO BE RECOGNIZED. THE IMPLEMENTATION OF THIS POLICY HAD NO IMPACT ON THE ORGANIZATION'S FINANCIAL STATEMENTS. THE ORGANIZATION'S INCOME TAX RETURNS ARE SUBJECT TO REVIEW AND EXAMINATION BY FEDERAL AND STATE AUTHORITIES. THE TAX RETURNS FOR THE FISCAL YEARS ENDED 2009 THROUGH 2011 ARE OPEN TO EXAMINATION BY FEDERAL AND STATE AUTHORITIES.</Explanation>
      </Form990ScheduleDPartXIV>
    </IRS990ScheduleD>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <FirstClassOrCharterTravel>X</FirstClassOrCharterTravel>
      <TravelForCompanions>X</TravelForCompanions>
      <IdemnificationGrossUpPayments>X</IdemnificationGrossUpPayments>
      <WrittenPolicyReTAndEExpenses>1</WrittenPolicyReTAndEExpenses>
      <SubstantiationRequired>1</SubstantiationRequired>
      <IndependentConsultant>X</IndependentConsultant>
      <WrittenEmploymentContract>X</WrittenEmploymentContract>
      <CompensationSurvey>X</CompensationSurvey>
      <BoardOrCommitteeApproval>X</BoardOrCommitteeApproval>
      <SeverancePayment>0</SeverancePayment>
      <SupplementalNonqualRetirePlan>0</SupplementalNonqualRetirePlan>
      <EquityBasedCompArrangement>0</EquityBasedCompArrangement>
      <Form990ScheduleJPartII>
        <NamePerson>SHEPARD R HURWITZ MD</NamePerson>
        <BaseCompensationFilingOrg>391501</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>12000</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>0</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>57250</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>32083</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>492834</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartIII>
        <ReturnReference>PART I, LINE 1A</ReturnReference>
        <Explanation>AMERICAN BOARD OF ORTHOPAEDIC SURGERY PROVIDED TRAVEL EXPENSE FOR WIVES/HUSBANDS OF THE DIRECTORS: STEPHEN ALBANESE, MD - $2,209 ANNUZIATO AMENDOLA, MD - $2,374 JEFFREY ANGLEN, MD - $1,074 JUDITH BAUMHAUER, MD - $2,771 JAMES E. CARPENTER, MD - $2,459 JOHN ERBLAND, MD - $3,331 HARRY HERKOWITZ, MD - $2,804 MICHELLE JAMES, MD - $750 JAMES KASSER, MD - $1,218 RANDALL E. MARCUS, MD - $3,885 J. L. MARSH, MD - $2,840 DAVID MARTIN, MD - $1,862 PETER M. MURRAY, MD - $3,132 REGIS O'KEEFE, MD - $1,781 TERRANCE PEABODY, MD - $1,114 JAMES ROBERSON, MD - $1,140 THOMAS VAIL, MD - $1,511 THE AMOUNTS WERE TAXABLE TO THE DIRECTORS.</Explanation>
      </Form990ScheduleJPartIII>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 11</ReturnReference>
        <Explanation>990 WILL BE EMAILED TO THE FINANCE COMMITTEE FOR REVIEW AND APPROVAL</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 12C</ReturnReference>
        <Explanation>CONFLICT FORMS WITH WRITTEN RESPONSES THAT THE EXECUTIVE DIRECTOR REVIEWS. IF ANY THRESHOLD IS REACHED THE ISSUE IS BROUGHT BEFORE THE ENTIRE BOARD FOR ACTION WHICH MAY INCLUDE ADVERSE ACTION OR REMOVAL FROM BOARD.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 15A</ReturnReference>
        <Explanation>WHEN DR. HURWITZ WAS HIRED AN OUTSIDE EMPLOYMENT AGENCY WAS HIRED TO HELP IN THE PROCESS. HIS CONTRACT SALARY AND BENEFITS REFLECT THIS NEGOTIATION. THE EXECUTIVE COMMITTEE OF THE ABOS DETERMINES THE % OF SALARY ADJUSTMENT EACH YEAR AND BONUS BASED ON A REVIEW THEY CONDUCT. 2012 FYE HURTWITZ RAISE WAS DETERMINED BY THE EXECUTIVE COMMITTEE OF THE BOARD.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION C, LINE 19</ReturnReference>
        <Explanation>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>CHANGES IN NET ASSETS OR FUND BALANCES:</Identifier>
        <ReturnReference>FORM 990, PART XI, LINE 5:</ReturnReference>
        <Explanation>NET UNREALIZED GAINS ON INVESTMENTS: 594,763.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
  </ReturnData>
</Return>