Quick answers
- Which hospitals does Mark M. Grohman work at?
- Medicare's official clinician data lists Mark M. Grohman at 2 hospitals: Down East Community Hospital and Northern Light Mercy Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark M. Grohman see patients?
- Medicare's clinician data lists 4 practice locations, including Machias, ME, Portland, ME and Westbrook, ME. Call before your visit to confirm the address.
- What is Mark M. Grohman's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Mark M. Grohman accept Medicare assignment?
- Yes. Medicare's clinician data says Mark M. Grohman 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 Mark M. Grohman?
- (207) 255-3356, as listed in official Medicare / NPI Registry data.
- What is Mark M. Grohman's NPI number?
- 1538393541. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark M. Grohman works
Medicare's Facility Affiliation Data lists Mark M. Grohman at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Down East Community HospitalMachias, ME · Critical Access Hospital · CCN 201311
- Northern Light Mercy HospitalPortland, ME · Acute Care Hospital · CCN 200008
Practice locations
Addresses where Mark M. Grohman is enrolled with Medicare (CMS data updated 2026-10-02).
- 11 Hospital DrMachias, ME 04654 (207) 255‑3356
- 155 Rover River PkwyPortland, ME 04102 (207) 879‑3000
- 175 Fore River PkwyPortland, ME 04102 (207) 879‑3000
- 40 Park RdWestbrook, ME 04092 (207) 857‑8174
Group practices
Medicare enrollment lists Mark M. Grohman as a member of these groups (CMS data updated 2026-10-02).
- Mercy Hospital301 clinicians in the group
- Down East Community Hospital29 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Machias
Clinicians with the same Medicare primary specialty in Machias, ME — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | University Of New England, College Of Osteo Medicine |
| Graduation year | 2009 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1538393541 |
| 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