Quick answers
- Which hospitals does Marc Fenster work at?
- Medicare's official clinician data lists Marc Fenster at 1 hospital: St John's Episcopal Hospital at South Shore. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marc Fenster see patients?
- Medicare's clinician data lists 2 practice locations, including Oceanside, NY and Far Rockaway, NY. Call before your visit to confirm the address.
- What is Marc Fenster's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Marc Fenster accept Medicare assignment?
- Yes. Medicare's clinician data says Marc Fenster 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 Fenster?
- (516) 632-3000, as listed in official Medicare / NPI Registry data.
- What is Marc Fenster's NPI number?
- 1144751595. 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 Fenster works
Medicare's Facility Affiliation Data lists Marc Fenster at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- St John's Episcopal Hospital at South ShoreFar Rockaway, NY · Acute Care Hospital · CCN 330395
Practice locations
Addresses where Marc Fenster is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Healthy WayOceanside, NY 11572 (516) 632‑3000
- 327 Beach 19th StFar Rockaway, NY 11691 (718) 869‑7919
Group practices
Medicare enrollment lists Marc Fenster as a member of these groups (CMS data updated 2026-10-02).
- St John's Medical Services PC90 clinicians in the group
- Five Towns Gastroenterology3 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Oceanside
Clinicians with the same Medicare primary specialty in Oceanside, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Albert Einstein College Of Medicine Of Yeshiva University |
| Graduation year | 2017 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1144751595 |
| 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