Skip to main content
IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 04-2103823

MASS GENERAL BRIGHAM INCORPORATED

Also known as NANTUCKET COTTAGE HOSPITAL

Tax-exempt · SOMERVILLE, MA 02145

Address and contacts

Address (IRS master file)
399 REVOLUTION DR STE 695, SOMERVILLE, MA 02145-1576
In care of
% TAX DEPARTMENT

What it must file and when

IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in September, so each return is due on the 15th day of the 5th month after that.

Tax yearYear endedDueIRS public records
2025September 30, 2026February 15, 2027Not due yet
2024September 30, 2025February 16, 2026Not on file
2023September 30, 2024February 17, 2025Not on file

File the 2025 990-EZ for MASS GENERAL BRIGHAM INCORPORATED

Due February 15, 2027 · e-filed with the IRS by 990.tax, an IRS-authorized e-file provider

IRS record

EIN
04-2103823
Tax-exempt status
501(c)(3): Charitable, religious, educational or scientific organization
Foundation status
Publicly supported organization (170(b)(1)(A)(vi))
Exempt since
2010
Accounting year ends
September
Files
Form 990 or 990-EZ
Category (NTEE)
Health care (E21)

Filing history

No e-filed return or e-Postcard in the IRS public files.

990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 04-2103823).

Questions about MASS GENERAL BRIGHAM INCORPORATED

What is the EIN of MASS GENERAL BRIGHAM INCORPORATED?
The employer identification number (EIN) of MASS GENERAL BRIGHAM INCORPORATED is 04-2103823.
Is MASS GENERAL BRIGHAM INCORPORATED tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2010.
Which annual return does MASS GENERAL BRIGHAM INCORPORATED file?
Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
When is the next return of MASS GENERAL BRIGHAM INCORPORATED due?
The return for tax year 2025 (the year ending September 30, 2026) is due February 15, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
When did MASS GENERAL BRIGHAM INCORPORATED last file with the IRS?
There is no e-filed return or e-Postcard for it in the IRS public files.

Other nonprofits in SOMERVILLE

All nonprofits in SOMERVILLE · Massachusetts · Health care