Quick answers
- Which hospitals does William J. Sonstein work at?
- Medicare's official clinician data lists William J. Sonstein at 2 hospitals: Chsli St Joseph Hospital and NYU Langone Hospitals. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William J. Sonstein see patients?
- Medicare's clinician data lists 2 practice locations, including Rockville Centre, NY and Bethpage, NY. Call before your visit to confirm the address.
- What is William J. Sonstein's specialty?
- Medicare lists Neurosurgery as the primary specialty.
- Does William J. Sonstein accept Medicare assignment?
- Yes. Medicare's clinician data says William J. Sonstein 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 J. Sonstein?
- (516) 605-2720, as listed in official Medicare / NPI Registry data.
- What is William J. Sonstein's NPI number?
- 1669495305. 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 J. Sonstein works
Medicare's Facility Affiliation Data lists William J. Sonstein at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Chsli St Joseph HospitalBethpage, NY · Acute Care Hospital · CCN 330332
- NYU Langone HospitalsNew York, NY · Acute Care Hospital · CCN 330214
Practice locations
Addresses where William J. Sonstein is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 Merrick Rd, 128wRockville Centre, NY 11570
- 4230 Hempstead Tpke, Suite 205Bethpage, NY 11714 (516) 605‑2720
Group practices
Medicare enrollment lists William J. Sonstein as a member of this group (CMS data updated 2026-10-02).
- Neurological Surgery Practice of Long Island PLLC14 clinicians in the group
Specialties
- Neurosurgeryprimary
Other neurosurgeons in Rockville Centre
Clinicians with the same Medicare primary specialty in Rockville Centre, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Temple University School Of Medicine |
| Graduation year | 1991 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1669495305 |
| 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