Quick answers
- Which hospitals does Jonathan Mazer work at?
- Medicare's official clinician data lists Jonathan Mazer at 1 hospital: Valley Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jonathan Mazer see patients?
- Medicare's clinician data lists 4 practice locations, including Belleville, NJ, Saddle Brook, NJ and Ridgewood, NJ. Call before your visit to confirm the address.
- What is Jonathan Mazer's specialty?
- Medicare lists Anesthesiology as the primary specialty.
- Does Jonathan Mazer accept Medicare assignment?
- Yes. Medicare's clinician data says Jonathan Mazer 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 Jonathan Mazer?
- (973) 450-2000, as listed in official Medicare / NPI Registry data.
- What is Jonathan Mazer's NPI number?
- 1902288194. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jonathan Mazer works
Medicare's Facility Affiliation Data lists Jonathan Mazer at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Valley HospitalParamus, NJ · Acute Care Hospital · CCN 310012
Practice locations
Addresses where Jonathan Mazer is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Clara Maass DrBelleville, NJ 07109 (973) 450‑2000
- 190 Midland AveSaddle Brook, NJ 07663 (718) 540‑8600
- 223 N Van Dien AveRidgewood, NJ 07450 (201) 847‑9403
- 561 Cranbury RdEast Brunswick, NJ 08816 (201) 620‑3010
Group practices
Medicare enrollment lists Jonathan Mazer as a member of these groups (CMS data updated 2026-10-02).
- RWJBH Observation Associates LLC1,008 clinicians in the group
- Bay Anesthesia80 clinicians in the group
- Bergen Anesthesia Group, P.C.66 clinicians in the group
- Centurion Anesthesia Surgical Centers LLC48 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Belleville
Clinicians with the same Medicare primary specialty in Belleville, NJ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2015 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1902288194 |
| 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