Quick answers
- Which hospitals does William Mask work at?
- Medicare's official clinician data lists William Mask at 5 hospitals: Bronxcare Hospital Center, Garnet Health Medical Center, Montefiore New Rochelle Hospital, Nyack Hospital and St John's Episcopal Hospital at South Shore. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William Mask see patients?
- Medicare's clinician data lists 4 practice locations, including Port Jervis, NY, Fayetteville, NC and Durham, NC. Call before your visit to confirm the address.
- What is William Mask's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does William Mask accept Medicare assignment?
- Yes. Medicare's clinician data says William Mask 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 Mask?
- (718) 223-4685, as listed in official Medicare / NPI Registry data.
- What is William Mask's NPI number?
- 1215030507. 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 Mask works
Medicare's Facility Affiliation Data lists William Mask at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Bronxcare Hospital CenterBronx, NY · Acute Care Hospital · CCN 330009
- Garnet Health Medical CenterMiddletown, NY · Acute Care Hospital · CCN 330126
- Montefiore New Rochelle HospitalNew Rochelle, NY · Acute Care Hospital · CCN 330184
- Nyack HospitalNyack, NY · Acute Care Hospital · CCN 330104
- St John's Episcopal Hospital at South ShoreFar Rockaway, NY · Acute Care Hospital · CCN 330395
Practice locations
Addresses where William Mask is enrolled with Medicare (CMS data updated 2026-10-02).
- 160 E Main StPort Jervis, NY 12771 (718) 223‑4685
- 1800 Lakeshore DrFayetteville, NC 28305 (866) 722‑1655
- 5921 Beech Bluff LnDurham, NC 27705 (866) 722‑1655
- 68 Harris Bushville RdHarris, NY 12742 (718) 223‑4685
Group practices
Medicare enrollment lists William Mask as a member of this group (CMS data updated 2026-10-02).
- Empire State Radiology P C268 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Port Jervis
Clinicians with the same Medicare primary specialty in Port Jervis, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Duke University School Of Medicine |
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1215030507 |
| 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