BOSTON MEDICAL LIBRARY: Form 990, tax year 2023

View the entire original 990 at ProPublica ↗

Organization: BOSTON MEDICAL LIBRARY (EIN 04-2013908)
Tax period: 2023-07-01 to 2024-06-30
Filed: 2025-05-01
IRS object ID: 202541219349301324
Schema version: 2023v6.0
Source: Download XML · Original 990 at ProPublica

Every field in the e-filed return. Faint text is the IRS element name, for citing.

Return header
Form 990
Schedule A
Schedule B
Schedule D
Schedule O
Schedule R

Return header ReturnHeader

Field	Value	IRS element (for citing)
Return	2025-05-01T08:54:34-05:00	ReturnTs
Tax Period End	2024-06-30	TaxPeriodEndDt

Preparer Firm PreparerFirmGrp

Field	Value	IRS element (for citing)
Preparer Firm EIN	042689883	PreparerFirmEIN

Preparer Firm Name PreparerFirmName

Field	Value	IRS element (for citing)
Business Name Line1	WOLF & COMPANY PC	BusinessNameLine1Txt

Preparer US Address PreparerUSAddress

Field	Value	IRS element (for citing)
Address Line1	255 STATE STREET	AddressLine1Txt
City	BOSTON	CityNm
State Abbreviation	MA	StateAbbreviationCd
ZIP	02109	ZIPCd

Field	Value	IRS element (for citing)
Return Type	990	ReturnTypeCd
Tax Period Begin	2023-07-01	TaxPeriodBeginDt

Filer Filer

Field	Value	IRS element (for citing)
EIN	042013908	EIN

Business Name BusinessName

Field	Value	IRS element (for citing)
Business Name Line1	BOSTON MEDICAL LIBRARY	BusinessNameLine1Txt
Business Name Line2	C/O DAVID M PINKHAM CPA LLC	BusinessNameLine2Txt

Field	Value	IRS element (for citing)
Business Name Control	BOST	BusinessNameControlTxt
Phone	7818340444	PhoneNum

US Address USAddress

Field	Value	IRS element (for citing)
Address Line1	475 SCHOOL ST SUITE 13	AddressLine1Txt
City	MARSHFIELD	CityNm
State Abbreviation	MA	StateAbbreviationCd
ZIP	02050	ZIPCd

Business Officer BusinessOfficerGrp

Field	Value	IRS element (for citing)
Person	RICHARD S PIETERS MD	PersonNm
Person Title	PRESIDENT	PersonTitleTxt
Phone	7818340444	PhoneNum
Signature	2025-04-23	SignatureDt
Discuss With Paid Preparer	Yes (1)	DiscussWithPaidPreparerInd

Field	Value	IRS element (for citing)
IRS Responsible Prty Info Curr	Yes (1)	IRSResponsiblePrtyInfoCurrInd

Preparer Person PreparerPersonGrp

Field	Value	IRS element (for citing)
Preparer Person	KAREN S NG	PreparerPersonNm
PTIN	P01067482	PTIN
Phone	6174399700	PhoneNum
Preparation	2025-04-23	PreparationDt

Field	Value	IRS element (for citing)
Tax	2023	TaxYr
Build TS	2025-03-06 01:10:19Z	BuildTS

Form 990 IRS990

Field	Value	IRS element (for citing)
Principal Officer	RICHARD S PIETERS MD	PrincipalOfficerNm

US Address USAddress

Field	Value	IRS element (for citing)
Address Line1	475 SCHOOL ST SUITE 13	AddressLine1Txt
City	MARSHFIELD	CityNm
State Abbreviation	MA	StateAbbreviationCd
ZIP	02050	ZIPCd

Field	Value	IRS element (for citing)
Gross Receipts	$3,512,953	GrossReceiptsAmt
Group Return For Affiliates	0	GroupReturnForAffiliatesInd
Organization501c3	Yes (X)	Organization501c3Ind
Website Address	HTTPS://BML.ORG/	WebsiteAddressTxt
Type Of Organization Corp	Yes (X)	TypeOfOrganizationCorpInd
Formation	1877	FormationYr
Legal Domicile State	MA	LegalDomicileStateCd
Activity Or Mission	TO BE A LIBRARY FOR THE DISSEMINATION OF MEDICAL KNOWLEDGE, THE PROMOTION OF MEDICAL EDUATION AND SCHOLARSHIP, AND THE PRESERVATION AND CELEBRATION OF MEDICAL HISTORY.	ActivityOrMissionDesc
Voting Members Governing Body	23	VotingMembersGoverningBodyCnt
Voting Members Independent	23	VotingMembersIndependentCnt
Total Employee	2	TotalEmployeeCnt
Total Volunteers	23	TotalVolunteersCnt
Total Gross UBI	$0	TotalGrossUBIAmt
Net Unrelated Bus Txbl Incm	$0	NetUnrelatedBusTxblIncmAmt
PY Contributions Grants	$52,183	PYContributionsGrantsAmt
CY Contributions Grants	$55,250	CYContributionsGrantsAmt
PY Program Service Revenue	$3,600	PYProgramServiceRevenueAmt
CY Program Service Revenue	$3,100	CYProgramServiceRevenueAmt
PY Investment Income	$586,138	PYInvestmentIncomeAmt
CY Investment Income	$776,935	CYInvestmentIncomeAmt
PY Other Revenue	$0	PYOtherRevenueAmt
CY Other Revenue	$0	CYOtherRevenueAmt
PY Total Revenue	$641,921	PYTotalRevenueAmt
CY Total Revenue	$835,285	CYTotalRevenueAmt
PY Grants And Similar Paid	$0	PYGrantsAndSimilarPaidAmt
CY Grants And Similar Paid	$0	CYGrantsAndSimilarPaidAmt
PY Benefits Paid To Members	$0	PYBenefitsPaidToMembersAmt
CY Benefits Paid To Members	$0	CYBenefitsPaidToMembersAmt
PY Salaries Comp Emp Bnft Paid	$33,155	PYSalariesCompEmpBnftPaidAmt
CY Salaries Comp Emp Bnft Paid	$14,820	CYSalariesCompEmpBnftPaidAmt
PY Total Prof Fndrsng Expns	$0	PYTotalProfFndrsngExpnsAmt
CY Total Prof Fndrsng Expns	$0	CYTotalProfFndrsngExpnsAmt
CY Total Fundraising Expense	$0	CYTotalFundraisingExpenseAmt
PY Other Expenses	$1,029,025	PYOtherExpensesAmt
CY Other Expenses	$1,260,760	CYOtherExpensesAmt
PY Total Expenses	$1,062,180	PYTotalExpensesAmt
CY Total Expenses	$1,275,580	CYTotalExpensesAmt
PY Revenues Less Expenses	-$420,259	PYRevenuesLessExpensesAmt
CY Revenues Less Expenses	-$440,295	CYRevenuesLessExpensesAmt
Total Assets BOY	$22,342,336	TotalAssetsBOYAmt
Total Assets EOY	$23,931,121	TotalAssetsEOYAmt
Total Liabilities BOY	$200,389	TotalLiabilitiesBOYAmt
Total Liabilities EOY	$119,471	TotalLiabilitiesEOYAmt
Net Assets Or Fund Balances BOY	$22,141,947	NetAssetsOrFundBalancesBOYAmt
Net Assets Or Fund Balances EOY	$23,811,650	NetAssetsOrFundBalancesEOYAmt
Info In Schedule O Part III	Yes (X)	InfoInScheduleOPartIIIInd
Mission	THE BOSTON MEDICAL LIBRARY IS A PHYSICIANS NON-PROFIT ORGANIZATION INCORPORATED IN 1877. THE BML MISSION, REVISED IN 2004, IS "TO BE A LIBRARY FOR THE DISSEMINATION OF MEDICAL KNOWLEDGE, THE PROMOTION OF MEDICAL EDUATION AND SCHOLARSHIP, AND THE PRESERVATION AND CELEBRATION OF MEDICAL HISTORY, AND THEREBY TO ADVANCE THE QUALITY OF HEALTH AND HEALTHCARE OF THE PEOPLE." THE BOSTON MEDICAL LIBRARY IS TO SUPPORT AND OPERATE FOR THE BENEFIT OF THE MASSACHUSETTS MEDICAL SOCIETY. THE BOSTON MEDICAL LIBRARY SERVES AS A RESOURCE FOR THE MEDICAL SCHOOL FACULTIES AND MEDICAL STUDENTS OF HARVARD MEDICAL SCHOOL, BOSTON UNIVERSITY MEDICAL SCHOOL, TUFTS UNIVERSITY SCHOOL OF MEDICINE AND THE UNIVERSITY OF MASSACHUSETTS MEDICAL SCHOOL; PRACTICING PHYSICIANS AND DENTISTS. IN 1946, THE BOSTON MEDICAL LIBRARY FORMALLY BECAME THE LIBRARY FOR THE MASSACHUSETTS MEDICAL SOCIETY.	MissionDesc
Significant New Program Srvc	0	SignificantNewProgramSrvcInd
Significant Change	0	SignificantChangeInd
Expense	$607,307	ExpenseAmt
Revenue	$3,100	RevenueAmt
Desc	MAINTENANCE OF LIBRARY OF MEDICINE AND ALLIED SCIENCES, THE PROMOTION AND ADVANCEMENT OF MEDICAL SCIENCE AND MEDICAL EDUCATION, AND THE CELEBRATION OF MEDICAL HISTORY	Desc
Total Program Service Expenses	$607,307	TotalProgramServiceExpensesAmt
Described In Section501c3	Yes (1)	DescribedInSection501c3Ind
Schedule B Required	Yes (1)	ScheduleBRequiredInd
Political Campaign Acty	0	PoliticalCampaignActyInd
Lobbying Activities	0	LobbyingActivitiesInd
Subject To Proxy Tax	0	SubjectToProxyTaxInd
Donor Advised Fund	0	DonorAdvisedFundInd
Conservation Easements	0	ConservationEasementsInd
Collections Of Art	Yes (1)	CollectionsOfArtInd
Credit Counseling	0	CreditCounselingInd
Donor Rstr Or Quasi Endowments	Yes (1)	DonorRstrOrQuasiEndowmentsInd
Report Land Building Equipment	0	ReportLandBuildingEquipmentInd
Report Investments Other Sec	0	ReportInvestmentsOtherSecInd
Report Program Related Invst	0	ReportProgramRelatedInvstInd
Report Other Assets	0	ReportOtherAssetsInd
Report Other Liabilities	0	ReportOtherLiabilitiesInd
Include FIN48 Footnote	Yes (1)	IncludeFIN48FootnoteInd
Independent Audit Fincl Stmt	Yes (1)	IndependentAuditFinclStmtInd
Consolidated Audit Fincl Stmt	0	ConsolidatedAuditFinclStmtInd
School Operating	0	SchoolOperatingInd
Foreign Office	0	ForeignOfficeInd
Foreign Activities	0	ForeignActivitiesInd
More Than5000 K To Org	0	MoreThan5000KToOrgInd
More Than5000 K To Individuals	0	MoreThan5000KToIndividualsInd
Professional Fundraising	0	ProfessionalFundraisingInd
Fundraising Activities	0	FundraisingActivitiesInd
Gaming Activities	0	GamingActivitiesInd
Operate Hospital	0	OperateHospitalInd
Grants To Organizations	0	GrantsToOrganizationsInd
Grants To Individuals	0	GrantsToIndividualsInd
Schedule J Required	0	ScheduleJRequiredInd
Tax Exempt Bonds	0	TaxExemptBondsInd
Engaged In Excess Benefit Trans	0	EngagedInExcessBenefitTransInd
PY Excess Benefit Trans	0	PYExcessBenefitTransInd
Loan Outstanding	0	LoanOutstandingInd
Grant To Related Person	0	GrantToRelatedPersonInd
Business Rln With Org Mem	0	BusinessRlnWithOrgMemInd
Business Rln With Fam Mem	0	BusinessRlnWithFamMemInd
Business Rln With35 Ctrl Ent	0	BusinessRlnWith35CtrlEntInd
Deductible Non Cash Contri	0	DeductibleNonCashContriInd
Deductible Art Contribution	0	DeductibleArtContributionInd
Terminate Operations	0	TerminateOperationsInd
Partial Liquidation	0	PartialLiquidationInd
Disregarded Entity	0	DisregardedEntityInd
Related Entity	Yes (1)	RelatedEntityInd
Related Organization Ctrl Ent	0	RelatedOrganizationCtrlEntInd
Trnsfr Exmpt Non Chrtbl Rltd Org	0	TrnsfrExmptNonChrtblRltdOrgInd
Activities Conducted Prtshp	0	ActivitiesConductedPrtshpInd
Schedule O Required	Yes (1)	ScheduleORequiredInd
IRP Document	10	IRPDocumentCnt
IRP Document W2 G	0	IRPDocumentW2GCnt
Backup Wthld Compliance	Yes (1)	BackupWthldComplianceInd
Employee	2	EmployeeCnt
Employment Tax Returns Filed	Yes (1)	EmploymentTaxReturnsFiledInd
Unrelated Bus Incm Over Limit	0	UnrelatedBusIncmOverLimitInd
Foreign Financial Account	0	ForeignFinancialAccountInd
Prohibited Tax Shelter Trans	0	ProhibitedTaxShelterTransInd
Taxable Party Notification	0	TaxablePartyNotificationInd
Nondeductible Contributions	0	NondeductibleContributionsInd
Quid Pro Quo Contributions	0	QuidProQuoContributionsInd
Form8282 Property Disposed Of	0	Form8282PropertyDisposedOfInd
Indoor Tanning Services	0	IndoorTanningServicesInd
Subj To Tax Rmnrtn Ex Prcht Pymt	0	SubjToTaxRmnrtnExPrchtPymtInd
Subject To Excs Tax Net Invst Inc	0	SubjectToExcsTaxNetInvstIncInd
Info In Schedule O Part VI	Yes (X)	InfoInScheduleOPartVIInd
Governing Body Voting Members	23	GoverningBodyVotingMembersCnt
Independent Voting Member	23	IndependentVotingMemberCnt
Family Or Business Rln	Yes (1)	FamilyOrBusinessRlnInd
Delegation Of Mgmt Duties	Yes (1)	DelegationOfMgmtDutiesInd
Change To Org Documents	0	ChangeToOrgDocumentsInd
Material Diversion Or Misuse	0	MaterialDiversionOrMisuseInd
Members Or Stockholders	0	MembersOrStockholdersInd
Election Of Board Members	Yes (1)	ElectionOfBoardMembersInd
Decisions Subject To Approva	0	DecisionsSubjectToApprovaInd
Minutes Of Governing Body	Yes (1)	MinutesOfGoverningBodyInd
Minutes Of Committees	Yes (1)	MinutesOfCommitteesInd
Officer Mailing Address	0	OfficerMailingAddressInd
Local Chapters	0	LocalChaptersInd
Form990 Provided To Gvrn Body	Yes (1)	Form990ProvidedToGvrnBodyInd
Conflict Of Interest Policy	Yes (1)	ConflictOfInterestPolicyInd
Annual Disclosure Covered Prsn	Yes (1)	AnnualDisclosureCoveredPrsnInd
Regular Monitoring Enfrc	Yes (1)	RegularMonitoringEnfrcInd
Whistleblower Policy	Yes (1)	WhistleblowerPolicyInd
Document Retention Policy	0	DocumentRetentionPolicyInd
Compensation Process CEO	0	CompensationProcessCEOInd
Compensation Process Other	0	CompensationProcessOtherInd
Investment In Joint Venture	0	InvestmentInJointVentureInd
States Where Copy Of Return Is Fld	MA	StatesWhereCopyOfReturnIsFldCd
Upon Request	Yes (X)	UponRequestInd

Books In Care Of Detail BooksInCareOfDetail

Business Name BusinessName

Field	Value	IRS element (for citing)
Business Name Line1	DAVID M PINKHAM CPA LLC	BusinessNameLine1Txt

Field	Value	IRS element (for citing)
Phone	7818340444	PhoneNum

US Address USAddress

Field	Value	IRS element (for citing)
Address Line1	475 SCHOOL STREET SUITE 13	AddressLine1Txt
City	MARSHFIELD	CityNm
State Abbreviation	MA	StateAbbreviationCd
ZIP	02050	ZIPCd

Field	Value	IRS element (for citing)
No Listed Persons Compensated	Yes (X)	NoListedPersonsCompensatedInd

Form990 Part VII Section A Form990PartVIISectionAGrp (23 entries)

TitleTitleTxt	Average Hours Per WeekAverageHoursPerWeekRt	Individual Trustee Or DirectorIndividualTrusteeOrDirectorInd	OfficerOfficerInd	Reportable Comp From OrgReportableCompFromOrgAmt	Reportable Comp From Rltd OrgReportableCompFromRltdOrgAmt	Other CompensationOtherCompensationAmt
RICHARD S PIETERS MD
TRUSTEE/PRESIDENT	5.00	Yes (X)	Yes (X)	$0	$0	$0
SUBRAMANYAN JAYASANKAR MD
TRUSTEE/CHAIR OF BOARD	1.00	Yes (X)		$0	$0	$0
EDITH JOLIN MD
VP/SECRETARY/TRUSTEE	5.00	Yes (X)	Yes (X)	$0	$0	$0
JAMES GESSNER MD
TRUSTEE/TREASURER	3.00	Yes (X)	Yes (X)	$0	$0	$0
SHAAN GANDHI MD
ASSIT. TREASURER/TRUSTEE	1.00	Yes (X)	Yes (X)	$0	$0	$0
MARY JANE HOULIHAN MD
TRUSTEE/VICE PRESIDENT	1.00	Yes (X)	Yes (X)	$0	$0	$0
JOEL RUBENSTEIN MD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
JACK EVJY MD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
KEN SHAMIR MD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
LEAH DORET MD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
ALEXANDRA BALSHI
TRUSTEE (AS OF 09/13/2023)	1.00	Yes (X)		$0	$0	$0
NIKI NIKRUI MD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
ALFRED DEMARIA MD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
DAVID LEADER DMD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
DEEB SALEM MD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
GLENN MARKENSON MD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
KRISTEN ROBSON MD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
JAMES FELDMAN MD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
KARL BENEDICT MD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
MCKINLEY GLOVER MD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
MICHELE PUGNAIRE MD
TRUSTEE	1.00	Yes (X)		$0	$0	$0
KHARA GRESHAM
TRUSTEE (AS OF 09/13/2023)	1.00	Yes (X)		$0	$0	$0
MICHAEL STANLEY
TRUSTEE (AS OF 09/13/2023)	1.00	Yes (X)		$0	$0	$0

Field	Value	IRS element (for citing)
Total Reportable Comp From Org	$0	TotalReportableCompFromOrgAmt
Tot Reportable Comp Rltd Org	$0	TotReportableCompRltdOrgAmt
Total Other Compensation	$0	TotalOtherCompensationAmt
Indiv Rcvd Greater Than100 K	0	IndivRcvdGreaterThan100KCnt
Former Ofcr Employees Listed	0	FormerOfcrEmployeesListedInd
Total Comp Greater Than150 K	0	TotalCompGreaterThan150KInd
Compensation From Other Srcs	0	CompensationFromOtherSrcsInd

Contractor Compensation ContractorCompensationGrp (2 entries)

Address Line1ContractorAddress/USAddress/AddressLine1Txt	CityContractorAddress/USAddress/CityNm	State AbbreviationContractorAddress/USAddress/StateAbbreviationCd	ZIPContractorAddress/USAddress/ZIPCd	ServicesServicesDesc	CompensationCompensationAmt
NUTTER MCCLENNEN & FISH LLP
155 SEAPORT BOULEVARD	BOSTON	MA	02210	LEGAL SERVICES	$490,318
AKA STRATEGY
PO BOX 521	STOCKBRIDGE	MA	01262	CONSULTING	$129,600

Field	Value	IRS element (for citing)
Cntrct Rcvd Greater Than100 K	2	CntrctRcvdGreaterThan100KCnt
Related Organizations	$25,000	RelatedOrganizationsAmt
All Other Contributions	$30,250	AllOtherContributionsAmt
Total Contributions	$55,250	TotalContributionsAmt

Program Service Revenue ProgramServiceRevenueGrp

Field	Value	IRS element (for citing)
Desc	DUES	Desc
Business	561000	BusinessCd
Total Revenue Column	$3,100	TotalRevenueColumnAmt
Related Or Exempt Func Income	$3,100	RelatedOrExemptFuncIncomeAmt

Field	Value	IRS element (for citing)
Total Program Service Revenue	$3,100	TotalProgramServiceRevenueAmt

Investment Income InvestmentIncomeGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$565,758	TotalRevenueColumnAmt
Exclusion	$565,758	ExclusionAmt

Gross Amount Sales Assets GrossAmountSalesAssetsGrp

Field	Value	IRS element (for citing)
Securities	$2,888,845	SecuritiesAmt

Less Cost Oth Basis Sales Expnss LessCostOthBasisSalesExpnssGrp

Field	Value	IRS element (for citing)
Securities	$2,677,668	SecuritiesAmt

Gain Or Loss GainOrLossGrp

Field	Value	IRS element (for citing)
Securities	$211,177	SecuritiesAmt

Net Gain Or Loss Investments NetGainOrLossInvestmentsGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$211,177	TotalRevenueColumnAmt
Exclusion	$211,177	ExclusionAmt

Total Revenue TotalRevenueGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$835,285	TotalRevenueColumnAmt
Related Or Exempt Func Income	$3,100	RelatedOrExemptFuncIncomeAmt
Unrelated Business Revenue	$0	UnrelatedBusinessRevenueAmt
Exclusion	$776,935	ExclusionAmt

Other Salaries And Wages OtherSalariesAndWagesGrp

Field	Value	IRS element (for citing)
Total	$13,053	TotalAmt
Program Services	$13,053	ProgramServicesAmt

Payroll Taxes PayrollTaxesGrp

Field	Value	IRS element (for citing)
Total	$1,767	TotalAmt
Program Services	$1,767	ProgramServicesAmt

Fees For Services Legal FeesForServicesLegalGrp

Field	Value	IRS element (for citing)
Total	$291,276	TotalAmt
Management And General	$291,276	ManagementAndGeneralAmt

Fees For Services Accounting FeesForServicesAccountingGrp

Field	Value	IRS element (for citing)
Total	$108,816	TotalAmt
Management And General	$108,816	ManagementAndGeneralAmt

Fees For Srvc Invst Mgmnt Fees FeesForSrvcInvstMgmntFeesGrp

Field	Value	IRS element (for citing)
Total	$65,387	TotalAmt
Management And General	$65,387	ManagementAndGeneralAmt

Fees For Services Other FeesForServicesOtherGrp

Field	Value	IRS element (for citing)
Total	$2,504	TotalAmt
Program Services	$2,504	ProgramServicesAmt

Office Expenses OfficeExpensesGrp

Field	Value	IRS element (for citing)
Total	$10,414	TotalAmt
Program Services	$10,414	ProgramServicesAmt

Information Technology InformationTechnologyGrp

Field	Value	IRS element (for citing)
Total	$2,911	TotalAmt
Program Services	$2,911	ProgramServicesAmt

Occupancy OccupancyGrp

Field	Value	IRS element (for citing)
Total	$63,250	TotalAmt
Program Services	$63,250	ProgramServicesAmt

Travel TravelGrp

Field	Value	IRS element (for citing)
Total	$3,385	TotalAmt
Program Services	$3,385	ProgramServicesAmt

Conferences Meetings ConferencesMeetingsGrp

Field	Value	IRS element (for citing)
Total	$4,347	TotalAmt
Program Services	$4,347	ProgramServicesAmt

Insurance InsuranceGrp

Field	Value	IRS element (for citing)
Total	$1,155	TotalAmt
Program Services	$1,155	ProgramServicesAmt

Other Expenses OtherExpensesGrp (3 entries)

DescDesc	TotalTotalAmt	Program ServicesProgramServicesAmt	Management And GeneralManagementAndGeneralAmt
TRANSITION COSTS	$606,979	$504,265	$102,714
STRATEGIC PLANNING	$100,080		$100,080
FILING FEES	$256	$256

Total Functional Expenses TotalFunctionalExpensesGrp

Field	Value	IRS element (for citing)
Total	$1,275,580	TotalAmt
Program Services	$607,307	ProgramServicesAmt
Management And General	$668,273	ManagementAndGeneralAmt
Fundraising	$0	FundraisingAmt

Cash Non Interest Bearing CashNonInterestBearingGrp

Field	Value	IRS element (for citing)
BOY	$27,449	BOYAmt
EOY	$27,945	EOYAmt

Accounts Receivable AccountsReceivableGrp

Field	Value	IRS element (for citing)
BOY	$93	BOYAmt
EOY	$0	EOYAmt

Prepaid Expenses Defrd Charges PrepaidExpensesDefrdChargesGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$40	EOYAmt

Investments Pub Traded Sec InvestmentsPubTradedSecGrp

Field	Value	IRS element (for citing)
BOY	$22,280,890	BOYAmt
EOY	$23,903,136	EOYAmt

Other Assets Total OtherAssetsTotalGrp

Field	Value	IRS element (for citing)
BOY	$33,904	BOYAmt
EOY	$0	EOYAmt

Total Assets TotalAssetsGrp

Field	Value	IRS element (for citing)
BOY	$22,342,336	BOYAmt
EOY	$23,931,121	EOYAmt

Accounts Payable Accr Expnss AccountsPayableAccrExpnssGrp

Field	Value	IRS element (for citing)
BOY	$166,485	BOYAmt
EOY	$116,721	EOYAmt

Deferred Revenue DeferredRevenueGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$2,750	EOYAmt

Other Liabilities OtherLiabilitiesGrp

Field	Value	IRS element (for citing)
BOY	$33,904	BOYAmt
EOY	$0	EOYAmt

Total Liabilities TotalLiabilitiesGrp

Field	Value	IRS element (for citing)
BOY	$200,389	BOYAmt
EOY	$119,471	EOYAmt

Field	Value	IRS element (for citing)
Organization Follows FASB117	Yes (X)	OrganizationFollowsFASB117Ind

No Donor Restriction Net Assets NoDonorRestrictionNetAssetsGrp

Field	Value	IRS element (for citing)
BOY	$12,504,902	BOYAmt
EOY	$13,215,290	EOYAmt

Donor Restriction Net Assets DonorRestrictionNetAssetsGrp

Field	Value	IRS element (for citing)
BOY	$9,637,045	BOYAmt
EOY	$10,596,360	EOYAmt

Total Net Assets Fund Balance TotalNetAssetsFundBalanceGrp

Field	Value	IRS element (for citing)
BOY	$22,141,947	BOYAmt
EOY	$23,811,650	EOYAmt

Tot Liab Net Assets Fund Balance TotLiabNetAssetsFundBalanceGrp

Field	Value	IRS element (for citing)
BOY	$22,342,336	BOYAmt
EOY	$23,931,121	EOYAmt

Field	Value	IRS element (for citing)
Reconcilation Revenue Expnss	-$440,295	ReconcilationRevenueExpnssAmt
Net Unrlzd Gains Losses Invst	$2,109,998	NetUnrlzdGainsLossesInvstAmt
Other Changes In Net Assets	$0	OtherChangesInNetAssetsAmt
Info In Schedule O Part XII	Yes (X)	InfoInScheduleOPartXIIInd
Method Of Accounting Accrual	Yes (X)	MethodOfAccountingAccrualInd
Accountant Compile Or Review	0	AccountantCompileOrReviewInd
FS Audited	Yes (1)	FSAuditedInd

FS Audited Basis FSAuditedBasisGrp

Field	Value	IRS element (for citing)
Separate Basis Fincl Stmt	Yes (X)	SeparateBasisFinclStmtInd

Field	Value	IRS element (for citing)
Audit Committee	Yes (1)	AuditCommitteeInd
Federal Grant Audit Required	0	FederalGrantAuditRequiredInd

Schedule A IRS990ScheduleA

Field	Value	IRS element (for citing)
Supporting Organization509a3	Yes (X)	SupportingOrganization509a3Ind
Supporting Org Type3 Func Int	Yes (X)	SupportingOrgType3FuncIntInd
Supported Organizations	1	SupportedOrganizationsCnt

Supported Org Information SupportedOrgInformationGrp

Supported Organization Name SupportedOrganizationName

Field	Value	IRS element (for citing)
Business Name Line1	MASSACHUSETTS MEDICAL SOCIETY	BusinessNameLine1Txt

Field	Value	IRS element (for citing)
EIN	042050773	EIN
Organization Type	10	OrganizationTypeCd
Governing Document Listed	Yes (1)	GoverningDocumentListedInd
Support	$0	SupportAmt
Other Support	$0	OtherSupportAmt

Field	Value	IRS element (for citing)
Supported Organizations Total	1	SupportedOrganizationsTotalCnt
Support Sum	$0	SupportSumAmt
Other Support Sum	$0	OtherSupportSumAmt

Form990 Sch A Supporting Org Form990SchASupportingOrgGrp

Field	Value	IRS element (for citing)
Listed By Name Governing Doc	Yes (1)	ListedByNameGoverningDocInd
Suprt Org No IRS Determination	Yes (1)	SuprtOrgNoIRSDeterminationInd
Supported Org Section C456	Yes (1)	SupportedOrgSectionC456Ind
Supported Org Qualified	Yes (1)	SupportedOrgQualifiedInd
Suprt Exclusively Sec170c2 B	Yes (1)	SuprtExclusivelySec170c2BInd
Supported Org Not Organized US	0	SupportedOrgNotOrganizedUSInd
Organization Change Suprt Org	0	OrganizationChangeSuprtOrgInd
Support Non Supported Org	0	SupportNonSupportedOrgInd
Payment Substantial Contribtr	0	PaymentSubstantialContribtrInd
Loan Disqualified Person	0	LoanDisqualifiedPersonInd
Controlled Disqualified Prsn	0	ControlledDisqualifiedPrsnInd
Disqualified Prsn Controll Int	0	DisqualifiedPrsnControllIntInd
Disqualified Prsn Ownr Int	0	DisqualifiedPrsnOwnrIntInd
Excess Business Holdings Rules	0	ExcessBusinessHoldingsRulesInd
Contribution Controller	0	ContributionControllerInd
Contribution Family	0	ContributionFamilyInd
Contribution35 Controlled	0	Contribution35ControlledInd

Form990 Sch A Type3 Sprt Org All Form990SchAType3SprtOrgAllGrp

Field	Value	IRS element (for citing)
Timely Provided Documents	Yes (1)	TimelyProvidedDocumentsInd
Officers Close Relationship	Yes (1)	OfficersCloseRelationshipInd
Supported Org Voice Investment	Yes (1)	SupportedOrgVoiceInvestmentInd

Form990 Sch A Type3 Func Int Form990SchAType3FuncIntGrp

Field	Value	IRS element (for citing)
Activities Test	Yes (X)	ActivitiesTestInd
Activities Further Exempt Prps	Yes (1)	ActivitiesFurtherExemptPrpsInd
Activities Engaged Org Invlmnt	Yes (1)	ActivitiesEngagedOrgInvlmntInd

Form990 Schedule A Part VI Form990ScheduleAPartVIGrp (6 entries)

Form And Line ReferenceFormAndLineReferenceDesc	ExplanationExplanationTxt
SCHEDULE A, PART IV, SECTION A, LINE 2	SEE THE ANSWER TO QUESTION 3.
SCHEDULE A, PART IV, SECTION A , LINE 3B:	SEE SCHEDULE A, PART IV, SECTION A, LINE 3C.
SCHEDULE A, PART IV, SECTION A , LINE 3C:	THE ORGANIZATION CONFIRMED THE SUPPORTED ORGANIZATION'S STATUS THROUGH THE IRS BUSINESS MASTER FILE. THE ORGANIZATION CONFIRMED THAT THE SUPPORTED ORGANIZATION WOULD MEET THE SUPPORT TESTS UNDER SECTION 509(A)(2) BY CONDUCTING AN ANALYSIS OF THE SUPPORT TEST. THE ORGANIZATION DOES NOT PROVIDE GRANTS TO ITS SUPPORTED ORGANIZATION, BUT ENSURES THAT ITS FINANCIAL AND PROGRAMMATIC ACTIVITIES ARE FOR SECTION 170(C)(2) PURPOSES.
SCHEDULE A, PART IV, SECTION D, LINE 3:	BY REASON OF THE RELATIONSHIP DESCRIBED IN SECTION (2), ALL FIVE OF THE OFFICERS OF THE ORGANIZATION ARE MEMBERS OF THE SUPPORTED ORGANIZATION. MEMBERS APPOINTED BY THE SUPPORTED ORGANIZATION SIT ON THE FINANCE AND INVESTMENT COMMITTEES OF THE ORGANIZATION. FURTHERMORE, THE PRESIDENT OF THE ORGANIZATION HAS THE OPPORTUNITY EVERY YEAR TO PRESENT TO THE GOVERNING BOARD OF THE SUPPORTED ORGANIZATION REGARDING THE ORGANIZATION'S AFFAIRS. AN OFFICER OF THE SUPPORTED ORGANIZATION ALSO IS DESIGNATED AS THE CONTACT PERSON FOR THE ORGANIZATION.
SCHEDULE A, PART IV, SECTION E , LINE 2A:	SEE SCHEDULE A, PART IV, SECTION E , LINE 2B.
SCHEDULE A, PART IV, SECTION E , LINE 2B:	THE ORGANIZATION'S MAINTENANCE AND SUPPORT OF A MEDICAL LIBRARY, ITS PRIMARY FUNCTION, DIRECTLY FURTHERS THE EXEMPT PURPOSES OF SUPPORTED ORGANIZATION, MASSACHUSETTS MEDICAL SOCIETY. THE LIBRARY IS A CRUCIAL RESOURCE TO THE SUPPORTED ORGANIZATION IN ALLOWING IT TO CARRY OUT THE PURPOSES SUPPORTED BY THE ORGANIZATION. SEE THE RESPONSE TO PART IV, SECTION D, QUESTION 3, ABOVE REGARDING RESPONSIVENESS.

Schedule B IRS990ScheduleB

Contributor Information ContributorInformationGrp

Field	Value	IRS element (for citing)
Contributor	RESTRICTED	ContributorNum

Contributor Business Name ContributorBusinessName

Field	Value	IRS element (for citing)
Business Name Line1	RESTRICTED	BusinessNameLine1

Contributor US Address ContributorUSAddress

Field	Value	IRS element (for citing)
Address Line1	RESTRICTED	AddressLine1
Address Line2	RESTRICTED	AddressLine2
City	RESTRICTED	City
State	RESTRICTED	State
ZIP Code	RESTRICTED	ZIPCode

Field	Value	IRS element (for citing)
Total Contributions	RESTRICTED	TotalContributionsAmt

Schedule D IRS990ScheduleD

Field	Value	IRS element (for citing)
Collection Used Pub Exhibition	Yes (X)	CollectionUsedPubExhibitionInd
Coll Used Scholarly Rsrch	Yes (X)	CollUsedScholarlyRsrchInd
Collection Used Preservation	Yes (X)	CollectionUsedPreservationInd
Solicited Assets Sale	0	SolicitedAssetsSaleInd

CY Endwmt Fund CYEndwmtFundGrp

Field	Value	IRS element (for citing)
Beginning Year Balance	$9,637,045	BeginningYearBalanceAmt
Investment Earnings Or Losses	$1,276,228	InvestmentEarningsOrLossesAmt
Other Expenditures	$316,913	OtherExpendituresAmt
End Year Balance	$10,596,360	EndYearBalanceAmt

CY Minus1 Yr Endwmt Fund CYMinus1YrEndwmtFundGrp

Field	Value	IRS element (for citing)
Beginning Year Balance	$8,996,476	BeginningYearBalanceAmt
Investment Earnings Or Losses	$731,180	InvestmentEarningsOrLossesAmt
Other Expenditures	$90,611	OtherExpendituresAmt
End Year Balance	$9,637,045	EndYearBalanceAmt

CY Minus2 Yr Endwmt Fund CYMinus2YrEndwmtFundGrp

Field	Value	IRS element (for citing)
Beginning Year Balance	$25,341,282	BeginningYearBalanceAmt
Contributions	$1,250	ContributionsAmt
Investment Earnings Or Losses	-$3,499,504	InvestmentEarningsOrLossesAmt
Other Expenditures	$12,846,552	OtherExpendituresAmt
End Year Balance	$8,996,476	EndYearBalanceAmt

CY Minus3 Yr Endwmt Fund CYMinus3YrEndwmtFundGrp

Field	Value	IRS element (for citing)
Beginning Year Balance	$20,208,951	BeginningYearBalanceAmt
Contributions	$1,660	ContributionsAmt
Investment Earnings Or Losses	$5,166,542	InvestmentEarningsOrLossesAmt
Other Expenditures	$35,871	OtherExpendituresAmt
End Year Balance	$25,341,282	EndYearBalanceAmt

CY Minus4 Yr Endwmt Fund CYMinus4YrEndwmtFundGrp

Field	Value	IRS element (for citing)
Beginning Year Balance	$20,453,143	BeginningYearBalanceAmt
Contributions	$5,225	ContributionsAmt
Investment Earnings Or Losses	-$200,503	InvestmentEarningsOrLossesAmt
Other Expenditures	$48,914	OtherExpendituresAmt
End Year Balance	$20,208,951	EndYearBalanceAmt

Field	Value	IRS element (for citing)
Board Designated Balance EOY	0.00000	BoardDesignatedBalanceEOYPct
Prmnnt Endowment Balance EOY	1.00000	PrmnntEndowmentBalanceEOYPct
Term Endowment Balance EOY	0.00000	TermEndowmentBalanceEOYPct
Endowments Held Unrelated Org	Yes (1)	EndowmentsHeldUnrelatedOrgInd
Endowments Held Related Org	0	EndowmentsHeldRelatedOrgInd
Total Book Value Land Buildings	$0	TotalBookValueLandBuildingsAmt
Footnote Text	Yes (X)	FootnoteTextInd
Total Rev Etc Audited Fincl Stmt	$2,879,896	TotalRevEtcAuditedFinclStmtAmt
Net Unrealized Gains Invst	$2,109,998	NetUnrealizedGainsInvstAmt
Other Revenue	-$65,387	OtherRevenueAmt
Revenue Not Reported	$2,044,611	RevenueNotReportedAmt
Revenue Subtotal	$835,285	RevenueSubtotalAmt
Revenue Not Reported Fincl Stmt	$0	RevenueNotReportedFinclStmtAmt
Total Revenue Per Form990	$835,285	TotalRevenuePerForm990Amt
Tot Expns Etc Audited Fincl Stmt	$1,210,193	TotExpnsEtcAuditedFinclStmtAmt
Expenses Not Reported	$0	ExpensesNotReportedAmt
Expenses Subtotal	$1,210,193	ExpensesSubtotalAmt
Other Expenses Not Included	$65,387	OtherExpensesNotIncludedAmt
Expenses Not Rpt Fincl Stmt	$65,387	ExpensesNotRptFinclStmtAmt
Total Expenses Per Form990	$1,275,580	TotalExpensesPerForm990Amt

Supplemental Information Detail SupplementalInformationDetail (6 entries)

Form And Line ReferenceFormAndLineReferenceDesc	ExplanationExplanationTxt
PART III, LINE 1A:	LITERARY PROPERTY PURCHASED OR RECEIVED AS A GIFT IS NOT CAPITALIZED. SUCH COLLECTIONS, WHICH ARE HELD FOR PUBLIC EXHIBITION OR EDUCATION, PROTECTED AND PRESERVED AND SUBJECT TO THE LIBRARY'S POLICY TO USE ANY PROCEEDS FROM SALE OF COLLECTIONS TO ACQUIRE OTHER COLLECTION ITEMS, ARE NOT RECOGNIZED AS ASSETS IN THE STATEMENTS OF FINANCIAL POSITION. NO LITERARY PROPERTY WAS PURCHASED FOR EITHER OF THE YEARS ENDED JUNE 30, 2024 OR 2023.
PART III, LINE 4:	LITERARY COLLECTION CONSISTS OF CURRENT AND HISTORICAL MEDICAL LITERATURE, ART OBJECTS AND MEDICAL ARTIFACTS THAT WERE EITHER PURCHASED OR DONATED TO THE LIBRARY FOR PUBLIC EXHIBITION, EDUCATION AND PRESERVATION.
PART V, LINE 4:	THE LIBRARY'S ENDOWMENT CONSISTS OF APPROXIMATELY SEVENTY INDIVIDUAL FUNDS ESTABLISHED FOR A VARIETY OF PURPOSES. ITS ENDOWMENT INCLUDES BOTH DONOR-RESTRICTED ENDOWMENT FUNDS AND FUNDS DESIGNATED BY THE BOARD OF TRUSTEES TO FUNCTION AS ENDOWMENTS. NET ASSETS ASSOCIATED WITH ENDOWMENT FUNDS, INCLUDING FUNDS DESIGNATED BY THE BOARD OF TRUSTEES TO FUNCTION AS ENDOWMENTS, ARE CLASSIFIED AND REPORTED BASED ON THE EXISTENCE OR ABSENCE OF DONOR-IMPOSED RESTRICTIONS. SUBJECT TO UPMIFA, AS DESCRIBED BELOW, THE PRINCIPAL MAY BE SPENT GIVEN A GOOD-FAITH DETERMINATION THAT SUCH SPENDING IS PRUDENT. THE BOARD OF TRUSTEES OF THE LIBRARY HAS INTERPRETED THE UNIFORM PRUDENT MANAGEMENT OF INSTITUTIONAL FUNDS ACT ("UPMIFA") AS ENACTED BY THE COMMONWEALTH OF MASSACHUSETTS EFFECTIVE JUNE 30, 2009, AS REQUIRING THE PRESERVATION OF THE ORIGINAL FAIR VALUE OF THE DONOR-RESTRICTED GIFT ABSENT EXPLICIT DONOR STIPULATIONS TO THE CONTRARY. THE SPENDING POLICY AND PHILOSOPHY, INCLUDING THE LONG TERM INVESTMENT MANAGEMENT POLICIES AND PROCEDURES, WERE DESIGNED TO FUNCTION AS INTEGRATED PROCESSES AND ARE ADMINISTERED TO REFLECT THE FOLLOWING FACTORS, AS DESCRIBED IN UPMIFA, FOR PRUDENT STEWARDS OF ASSETS: - THE DURATION AND PRESERVATION OF A FUND; - THE PURPOSE OF THE ORGANIZATION AND THE DONOR DESIGNATIONS THERETO; - GENERAL ECONOMIC CONDITIONS; - THE POSSIBLE EFFECTS OF INFLATION AND DEFLATION; - THE EXPECTED TOTAL RETURN OF THE CHARITABLE ASSETS; - OTHER RESOURCES OF THE ORGANIZATION; AND - THE INVESTMENT POLICIES. IN ESTABLISHING ITS SPENDING POLICY, THE LIBRARY CONSIDERED THE LONG-TERM EXPECTED RETURN ON ITS ENDOWMENT. ACCORDINGLY, THE BOARD OF TRUSTEES OF THE LIBRARY HAS TRADITIONALLY AUTHORIZED THE APPROPRIATION FOR EXPENDITURE FROM ENDOWMENT FUNDS OF UP TO THREE PERCENT (3%) OF THE RESPECTIVE FUND'S VALUE, AS DEFINED, IN ANY FISCAL YEAR. THIS IS CONSISTENT WITH THE LIBRARY'S OBJECTIVE TO MAINTAIN THE PURCHASING POWER OF THE ENDOWMENT ASSETS HELD FOR A SPECIFIED TERM AS WELL AS TO PROVIDE ADDITIONAL REAL GROWTH THROUGH NEW GIFTS AND INVESTMENT RETURN. IN ORDER TO ADDRESS FUNDING FOR INCREASED TRANSITION COSTS RELATED TO THE BOSTON MEDICAL LIBRARY'S FUTURE PLANS, EFFECTIVE JANUARY 2022, THE BOARD OF TRUSTEES VOTED TO PAUSE THE 3% SPENDING POLICY AND ELIMINATE BOARD-DESIGNATED RESTRICTIONS. IN ORDER TO ADDRESS FUNDING FOR INCREASED TRANSITION COSTS RELATED TO THE BOSTON MEDICAL LIBRARY'S FUTURE PLANS, EFFECTIVE JANUARY 2022, THE BOARD OF TRUSTEES VOTED TO PAUSE THE THREE PERCENT SPENDING POLICY AND ELIMINATE BOARD-DESIGNATED RESTRICTIONS. BOARD-DESIGNATED ENDOWMENT FUNDS HAVE BEEN REDESIGNATED AS UNDESIGNATED.
PART X, LINE 2:	THE LIBRARY IS EXEMPT FROM FEDERAL AND STATE INCOME TAXES UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE. TAX POSITIONS, INCLUDING THE POSITION THAT THE LIBRARY QUALIFIES AS A TAX-EXEMPT ENTITY, TAKEN OR EXPECTED TO BE TAKEN IN THE COURSE OF PREPARING THE LIBRARY'S TAX RETURNS, ARE REQUIRED TO BE EVALUATED TO DETERMINE WHETHER THE TAX POSITIONS ARE "MORE-LIKELY-THAN-NOT" OF BEING SUSTAINED BY THE APPLICABLE TAX AUTHORITY. TAX POSITIONS NOT DEEMED TO MEET A MORE-LIKELY-THAN-NOT THRESHOLD WOULD BE RECORDED AS A TAX EXPENSE IN THE CURRENT YEAR. THE LIBRARY DOES NOT HAVE ANY UNCERTAIN TAX POSITIONS AT JUNE 30, 2024 OR 2023 WHICH REQUIRE ACCRUAL OR DISCLOSURE. GENERALLY, THE LIBRARY IS SUBJECT TO FEDERAL AND STATE TAX EXAMINATION BY TAX AUTHORITIES FOR ALL YEARS SUBSEQUENT TO JUNE 30, 2020. THE LIBRARY'S POLICY IS TO RECOGNIZE ANY INTEREST AND PENALTIES RELATED TO TAX MATTERS AS AN EXPENSE WHEN PAID.
PART XI, LINE 2D - OTHER ADJUSTMENTS:	RECLASS INVESTMENT EXPENSES FROM REVENUE TO EXPENSE -65,387.
PART XII, LINE 4B - OTHER ADJUSTMENTS:	RECLASS INVESTMENT EXPENSES FROM REVENUE TO EXPENSE 65,387.

Schedule O IRS990ScheduleO

Supplemental Information Detail SupplementalInformationDetail (8 entries)

Form And Line ReferenceFormAndLineReferenceDesc	ExplanationExplanationTxt
FORM 990, PART VI, SECTION A, LINE 2	DRS. PIETERS AND JOLIN ARE SPOUSES.
FORM 990, PART VI, SECTION A, LINE 3	BOSTON MEDICAL LIBRARY DELEGATES CONTROL OVER ITS ACCOUNTING FUNCTION TO DAVID M. PINKHAM, CPA, LLC. THE ORGANIZATION'S ACCOUNTING EXPENSES FOR THE YEAR WERE $80,463
FORM 990, PART VI, SECTION A, LINE 7A	MASSACHUSETTS MEDICAL SOCIETY, THE BOSTON MEDICAL LIBARARY (BML)'S SUPPORTED ORGANIZATION, APPOINTS 11 OF THE 23 MEMBERS OF THE BML BOARD OF TRUSTEES
FORM 990, PART VI, SECTION B, LINE 11B	THE FORM 990 WILL BE REVIEWED BY BOSTON MEDICAL LIBRARY'S PRESIDENT AND TREASURER PRIOR TO BEING FILED. THE 990 IS PROVIDED TO ALL BOARD MEMBER TO REVIEW BEFORE FILING.
FORM 990, PART VI, SECTION B, LINE 12C	THE CORPORATION MAY ENTER INTO CONTRACTS OR TRANSACTIONS WITH AN OFFICER, TRUSTEE OR FELLOW OR WITH ANY CORPORATION OR OTHER CONCERN IN WHICH AN OFFICER, TRUSTEE OR FELLOW IS A STOCKHOLDER, PARTNER DIRECTOR, OFFICER OR EMPLOYEE OR IS OTHERWISE INTERESTED. IN THE ABSENCE OF FRAUD OR BAD FAITH, NO SUCH CONTRACT OR TRANSACTION SHALL BE INVALIDATED OR AFFECTED BY THE FACT THAT THE PRESENCE OF SUCH INTERESTED PERSON WAS NECESSARY TO CONSTITUTE A QUORUM AT A MEETING OF THE BOARD OF TRUSTEES (OR ANY AUTHORIZED COMMITTEE THEREOF) AT WHICH SUCH CONTRACT OR TRANSACTION WAS AUTHORIZED OR THAT THE VOTE OF SUCH INTERESTED PERSON WAS NECESSARY FOR THE ADOPTION OF SUCH CONTRACT OR TRANSACTION, PROVIDED THAT IF SUCH INTEREST WAS MATERIAL, IT SHALL HAVE BEEN DISCLOSED TO THE TRUSTEES OR FELLOWS VOTING ON SUCH CONTRACT OR TRANSACTION. A GENERAL NOTICE TO ANY PERSON VOTING ON SUCH CONTRACT OR TRANSACTION THAT AN OFFICER, TRUSTEE OR FELLOW HAS A MATERIAL INTEREST IN ANY CORPORATION OR OTHER CONCERN SHALL BE SUFFICIENT DISCLOSURE AS TO SUCH OFFICER, TRUSTEE OR FELLOW WITH RESPECT TO ALL CONTRACTS AND TRANSACTIONS WITH SUCH CORPORATION OR OTHER CONCERN. MORE INFORMATION IS AVAILABLE UPON REQUEST. THE BOARD ADOPTED A CONFLICT OF INTEREST POLICY THAT INCLUDES ANNUAL REVIEW OF THE AFFIDAVITS SIGNED BY ALL TRUSTEES & OFFICERS & IF CONFLICTS EXIST THE BOARD WILL DEAL WITH THEM ACCORDINGLY.
FORM 990, PART VI, SECTION B, LINE 15	BML HAD TWO EMPLOYEES IN FY2024. BML ALSO REIMBURSED THE PERSONNEL SERVICES PROVIDED BY HARVARD DURING THE TAX YEAR.
FORM 990, PART VI, SECTION C, LINE 19	GOVERNING DOCUMENTS AND THE CONFLICTS OF INTEREST POLICY ARE AVAILABLE UPON REQUEST. THE FORM 990 IS AVAILABLE UPON REQUEST FOR A NOMINAL FEE CHARGED FOR REPRODUCTION AND POSTAGE.
FORM 990, PART XII, LINE 2C	THERE WAS NO CHANGE IN THE OVERSIGHT PROCESS OR SELECTION PROCESS DURING THE TAX YEAR.

Schedule R IRS990ScheduleR

Id Related Tax Exempt Org IdRelatedTaxExemptOrgGrp

Disregarded Entity Name DisregardedEntityName

Field	Value	IRS element (for citing)
Business Name Line1	MASSACHUSETTS MEDICAL SOCIETY	BusinessNameLine1Txt

US Address USAddress

Field	Value	IRS element (for citing)
Address Line1	860 WINTER STREET	AddressLine1Txt
City	WALTHAM	CityNm
State Abbreviation	MA	StateAbbreviationCd
ZIP	02451	ZIPCd

Field	Value	IRS element (for citing)
EIN	042050773	EIN
Primary Activities	ASSOCIATION	PrimaryActivitiesTxt
Legal Domicile State	MA	LegalDomicileStateCd
Exempt Code Section	501(C)(6)	ExemptCodeSectionTxt

Direct Controlling Entity Name DirectControllingEntityName

Field	Value	IRS element (for citing)
Business Name Line1	NONE	BusinessNameLine1Txt

Field	Value	IRS element (for citing)
Controlled Organization	0	ControlledOrganizationInd

Field	Value	IRS element (for citing)
Receipt Of Int Annts Rnts Rylts	0	ReceiptOfIntAnntsRntsRyltsInd
Gift Grnt Or Cap Contri To Oth Org	0	GiftGrntOrCapContriToOthOrgInd
Gift Grnt Cap Contri From Oth Org	Yes (1)	GiftGrntCapContriFromOthOrgInd
Loans Or Guarantees To Other Org	0	LoansOrGuaranteesToOtherOrgInd
Loans Or Guarantees From Oth Org	0	LoansOrGuaranteesFromOthOrgInd
Div Related Organization	0	DivRelatedOrganizationInd
Asset Sale To Other Org	0	AssetSaleToOtherOrgInd
Asset Purchase From Other Org	0	AssetPurchaseFromOtherOrgInd
Asset Exchange	0	AssetExchangeInd
Rental Of Facilities To Oth Org	0	RentalOfFacilitiesToOthOrgInd
Rental Of Fclts From Oth Org	0	RentalOfFcltsFromOthOrgInd
Perform Of Services For Oth Org	0	PerformOfServicesForOthOrgInd
Perform Of Services By Other Org	0	PerformOfServicesByOtherOrgInd
Sharing Of Facilities	0	SharingOfFacilitiesInd
Paid Employees Sharing	0	PaidEmployeesSharingInd
Reimbursement Paid To Other Org	0	ReimbursementPaidToOtherOrgInd
Reimbursement Paid By Other Org	0	ReimbursementPaidByOtherOrgInd
Transfer To Other Org	0	TransferToOtherOrgInd
Transfer From Other Org	0	TransferFromOtherOrgInd

Transactions Related Org TransactionsRelatedOrgGrp

Other Organization Name OtherOrganizationName

Field	Value	IRS element (for citing)
Business Name Line1	MASSACHUSETTS MEDICAL SOCIETY	BusinessNameLine1Txt

Field	Value	IRS element (for citing)
Transaction Type	C	TransactionTypeTxt
Involved	$25,000	InvolvedAmt
Method Of Amount Determination	CASH	MethodOfAmountDeterminationTxt