Quick answers
- Which hospitals does William B. Terrin work at?
- Medicare's official clinician data lists William B. Terrin at 2 hospitals: Montefiore Medical Center and Mount Sinai South Nassau. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William B. Terrin see patients?
- Medicare's clinician data lists 2 practice locations, including Mount Vernon, NY and Bronx, NY. Call before your visit to confirm the address.
- What is William B. Terrin's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does William B. Terrin accept Medicare assignment?
- Yes. Medicare's clinician data says William B. Terrin 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 William B. Terrin?
- (914) 664-8000, as listed in official Medicare / NPI Registry data.
- What is William B. Terrin's NPI number?
- 1154718476. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William B. Terrin works
Medicare's Facility Affiliation Data lists William B. Terrin at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Montefiore Medical CenterBronx, NY · Acute Care Hospital · CCN 330059
- Mount Sinai South NassauOceanside, NY · Acute Care Hospital · CCN 330198
Practice locations
Addresses where William B. Terrin is enrolled with Medicare (CMS data updated 2026-10-02).
- 12 N 7th AveMount Vernon, NY 10550 (914) 664‑8000
- 2475 Saint Raymonds AveBronx, NY 10461 (718) 920‑4321
Group practices
Medicare enrollment lists William B. Terrin as a member of this group (CMS data updated 2026-10-02).
- Hospitalist Medicine Physicians of New York PLLC36 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Mount Vernon
Clinicians with the same Medicare primary specialty in Mount Vernon, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2013 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1154718476 |
| 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