Quick answers
- Which hospitals does Bret A. Ancowitz work at?
- Medicare's official clinician data lists Bret A. Ancowitz at 4 hospitals: Beth Israel Deaconess Medical Center, Cambridge Health Alliance, Heywood Hospital - and South Shore Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Bret A. Ancowitz see patients?
- Medicare's clinician data lists 5 practice locations, including Cambridge, MA, Braintree, MA and Newton, MA. Call before your visit to confirm the address.
- What is Bret A. Ancowitz's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Bret A. Ancowitz accept Medicare assignment?
- Yes. Medicare's clinician data says Bret A. Ancowitz accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Bret A. Ancowitz?
- (617) 665-1000, as listed in official Medicare / NPI Registry data.
- What is Bret A. Ancowitz's NPI number?
- 1962607051. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Bret A. Ancowitz works
Medicare's Facility Affiliation Data lists Bret A. Ancowitz at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Beth Israel Deaconess Medical CenterBoston, MA · Acute Care Hospital · CCN 220086
- Cambridge Health AllianceCambridge, MA · Acute Care Hospital · CCN 220011
- Heywood Hospital -Gardner, MA · Acute Care Hospital · CCN 220095
- South Shore HospitalSouth Weymouth, MA · Acute Care Hospital · CCN 220100
Practice locations
Addresses where Bret A. Ancowitz is enrolled with Medicare (CMS data updated 2026-10-02).
- 1493 Cambridge StCambridge, MA 02139 (617) 665‑1000
- 1681 Washington StBraintree, MA 02184 (781) 848‑6040
- 2014 Washington StNewton, MA 02462 (617) 243‑6000
- 250 Green StGardner, MA 01440 (978) 630‑6460
- 541 Main St, Suite 414S Weymouth, MA 02190 (781) 952‑1433
Group practices
Medicare enrollment lists Bret A. Ancowitz as a member of these groups (CMS data updated 2026-10-02).
- Cambridge Public Health Commission656 clinicians in the group
- Mass General Brigham Medical Group Suburban Massachusetts Inc602 clinicians in the group
- Harbor Medical Associates Inc127 clinicians in the group
- Heywood Medical Group Inc.110 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Cambridge
Clinicians with the same Medicare primary specialty in Cambridge, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Icahn School Of Medicine At Mount Sinai |
| Graduation year | 2000 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1962607051 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians