DialClerk Directory

Accountable care organizations

Mass General Brigham ACO, LLC

Phone, published email, fax, addresses and the next step for your office.

2 contact routesNo directory research calls placed

provider services

ACO public reporting / administrative contact

Official dataset read
Phone

No phone listed for this route

Published email

abarrett15@mgb.org

CMS-designated ACO public reporting / administrative contact; not a secure clinical or claims submission address.

Published hours

Not published in this record

Product, plan and location

medicare
Massachusetts · New Hampshire

Mailing address

Not researched for this route

CMS ACO ID A4641. Public reporting / administrative contact from the CMS PY2026 dataset, modified April 16, 2026. This is not a claims, eligibility, enrollment, or urgent clinical line. State tags identify states containing counties where more than 1% of assigned beneficiaries reside; they are not a statewide service-coverage or eligibility guarantee. The ACO reporting website was supplied in the dataset and was not individually reviewed in this batch.

View source ↗ · Source checked 2026-10-22 · Source published 2026-04-16 · CMS ACO dataset overview ↗ · CMS field definitions ↗

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provider services

Mass General Brigham Medicare ACO hotline and primary contact

Official page read
Phone800-229-0384Published email

mgbmedicareaco@mgb.org

Role mailbox published for Mass General Brigham ACO, LLC primary contact.

Published hours

Not published in this record

Product, plan and location

medicare
National contact — confirm product and location

Mailing address

Not researched for this route

Physical address
800 Boylston Street, Suite 1150, Boston, MA 02199

ACO administrative location published in the official ACO name and location section; no claims, medical-records or correspondence destination is inferred.

Current public reporting PDF names Mass General Brigham ACO, LLC exactly. Current patient page calls this the Medicare ACO hotline. Separate Mass General Brigham ACO 2, LLC, MassHealth ACO and health-plan channels are not merged. The former catalog website path returns 404; metadata correction is proposed separately.

View source ↗ · Source checked 2026-10-22 · Current Medicare ACO information page ↗

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Wait time: not establishedBest time from caller reports: not established. Published hours are not a wait forecast.

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