Quick answers
- Which hospitals does Marc Grossman work at?
- Medicare's official clinician data lists Marc Grossman at 5 hospitals: Boston Medical Center, Catholic Medical Center, Good Samaritan Medical Center, Parkland Medical Center and Portsmouth Regional Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marc Grossman see patients?
- Medicare's clinician data lists 2 practice locations, including Boston, MA and Brockton, MA. Call before your visit to confirm the address.
- What is Marc Grossman's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Marc Grossman accept Medicare assignment?
- Yes. Medicare's clinician data says Marc Grossman 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 Marc Grossman?
- (617) 414-5481, as listed in official Medicare / NPI Registry data.
- What is Marc Grossman's NPI number?
- 1598799025. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marc Grossman works
Medicare's Facility Affiliation Data lists Marc Grossman at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Boston Medical CenterBoston, MA · Acute Care Hospital · CCN 220031
- Catholic Medical CenterManchester, NH · Acute Care Hospital · CCN 300034
- Good Samaritan Medical CenterBrockton, MA · Acute Care Hospital · CCN 220111
- Parkland Medical CenterDerry, NH · Acute Care Hospital · CCN 300017
- Portsmouth Regional HospitalPortsmouth, NH · Acute Care Hospital · CCN 300029
Practice locations
Addresses where Marc Grossman is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Boston Medical Ctr PlBoston, MA 02118 (617) 414‑5481
- 235 N Pearl StBrockton, MA 02301 (508) 427‑3000
Group practices
Medicare enrollment lists Marc Grossman as a member of these groups (CMS data updated 2026-10-02).
- BMC Affiliated Physicians, Inc.564 clinicians in the group
- Boston Emergency Physician Foundation Inc77 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Boston
Clinicians with the same Medicare primary specialty in Boston, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1997 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1598799025 |
| 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