Quick answers
- Which hospitals does Mark P. Ghassibi work at?
- Medicare's official clinician data lists Mark P. Ghassibi at 3 hospitals: Richmond University Medical Center, Suny/Downstate University Hospital of Brooklyn and Woodhull Medical & Mental Health Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark P. Ghassibi see patients?
- Medicare's clinician data lists 6 practice locations, including Staten Island, NY and Brooklyn, NY. Call before your visit to confirm the address.
- What is Mark P. Ghassibi's specialty?
- Medicare lists Ophthalmology as the primary specialty.
- Does Mark P. Ghassibi accept Medicare assignment?
- Yes. Medicare's clinician data says Mark P. Ghassibi 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 P. Ghassibi?
- (718) 818-1058, as listed in official Medicare / NPI Registry data.
- What is Mark P. Ghassibi's NPI number?
- 1356871230. 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 P. Ghassibi works
Medicare's Facility Affiliation Data lists Mark P. Ghassibi at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Richmond University Medical CenterStaten Island, NY · Acute Care Hospital · CCN 330028
- Suny/Downstate University Hospital of BrooklynBrooklyn, NY · Acute Care Hospital · CCN 330350
- Woodhull Medical & Mental Health CenterBrooklyn, NY · Acute Care Hospital · CCN 330396
Practice locations
Addresses where Mark P. Ghassibi is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 1058 Forest AveStaten Island, NY 10310 (718) 818‑1058
- 1520 Flatbush AveBrooklyn, NY 11210 (718) 270‑1714
- 26 Court StBrooklyn, NY 11242 (718) 780‑1530
- 4434 Amboy RdStaten Island, NY 10312 (718) 984‑9658
- 4434 Amboy Rd, Suite BStaten Island, NY 10312 (718) 984‑9637
Group practices
Medicare enrollment lists Mark P. Ghassibi as a member of these groups (CMS data updated 2026-10-02).
- University Physicians of Brooklyn, Inc.177 clinicians in the group
- Amboy Medical Practice PC173 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Staten Island
Clinicians with the same Medicare primary specialty in Staten Island, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | George Washington University School Of Medicine |
| Graduation year | 2016 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1356871230 |
| 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