Quick answers
- Which hospitals does Seamus Mark work at?
- Medicare's official clinician data lists Seamus Mark at 4 hospitals: Brigham and Women's Hospital, Massachusetts General Hospital, Milford Regional Medical Center and Newton-Wellesley Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Seamus Mark see patients?
- Medicare's clinician data lists 2 practice locations, including Newton, MA and Millis, MA. Call before your visit to confirm the address.
- What is Seamus Mark's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Seamus Mark accept Medicare assignment?
- Yes. Medicare's clinician data says Seamus Mark 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.
- Does Seamus Mark offer telehealth?
- Medicare's clinician data says Seamus Mark offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Seamus Mark?
- (617) 243-6000, as listed in official Medicare / NPI Registry data.
- What is Seamus Mark's NPI number?
- 1538212477. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Seamus Mark works
Medicare's Facility Affiliation Data lists Seamus Mark at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Brigham and Women's HospitalBoston, MA · Acute Care Hospital · CCN 220110
- Massachusetts General HospitalBoston, MA · Acute Care Hospital · CCN 220071
- Milford Regional Medical CenterMilford, MA · Acute Care Hospital · CCN 220090
- Newton-Wellesley HospitalNewton, MA · Acute Care Hospital · CCN 220101
Practice locations
Addresses where Seamus Mark is enrolled with Medicare (CMS data updated 2026-10-02).
- 2014 Washington StNewton, MA 02462 (617) 243‑6000
- 969 Main StMillis, MA 02054 (508) 376‑3000
Group practices
Medicare enrollment lists Seamus Mark as a member of this group (CMS data updated 2026-10-02).
- Mass General Brigham Medical Group Suburban Massachusetts Inc602 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Newton
Clinicians with the same Medicare primary specialty in Newton, MA — not a recommendation.
Clinician information
| Medical school | Icahn School Of Medicine At Mount Sinai |
|---|---|
| Graduation year | 2006 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1538212477 |
| 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