Quick answers
- Which hospitals does James M. Orsini work at?
- Medicare's official clinician data lists James M. Orsini at 1 hospital: Hackensack Meridian Mountainside Medical. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does James M. Orsini see patients?
- Medicare's clinician data lists 7 practice locations, including Montclair, NJ, Belleville, NJ and Mount Holly, NJ. Call before your visit to confirm the address.
- What is James M. Orsini's specialty?
- Medicare lists Hematology/Oncology as the primary specialty.
- Does James M. Orsini accept Medicare assignment?
- Yes. Medicare's clinician data says James M. Orsini 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 James M. Orsini?
- (609) 835-2900, as listed in official Medicare / NPI Registry data.
- What is James M. Orsini's NPI number?
- 1922084185. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where James M. Orsini works
Medicare's Facility Affiliation Data lists James M. Orsini at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Hackensack Meridian Mountainside MedicalMontclair, NJ · Acute Care Hospital · CCN 310054
Practice locations
Addresses where James M. Orsini is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 7; the Medicare profile lists all.
- 1 Bay AveMontclair, NJ 07042 (609) 835‑2900
- 1 Bay Ave, Suite 2Montclair, NJ 07042 (609) 835‑2900
- 1 Clara Maass Dr, Suite 200Belleville, NJ 07109 (609) 835‑2900
- 175 Madison AveMount Holly, NJ 08060 (844) 346‑7222
- 180 White RdLittle Silver, NJ 07739 (609) 835‑2900
Group practices
Medicare enrollment lists James M. Orsini as a member of this group (CMS data updated 2026-10-02).
- Regional Cancer Care Associates LLC151 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Montclair
Clinicians with the same Medicare primary specialty in Montclair, NJ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1974 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1922084185 |
| 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