Quick answers
- Which hospitals does Michael S. Grenis work at?
- Medicare's official clinician data lists Michael S. Grenis at 1 hospital: University Medical Center of Princeton at Plainsboro. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Michael S. Grenis see patients?
- Medicare's clinician data lists 4 practice locations, including Monroe Twp, NJ, Cranberry Township, PA and Cranberry Twp, PA. Call before your visit to confirm the address.
- What is Michael S. Grenis's specialty?
- Medicare lists Orthopedic Surgery as the primary specialty.
- Does Michael S. Grenis accept Medicare assignment?
- Yes. Medicare's clinician data says Michael S. Grenis 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 Michael S. Grenis?
- (609) 924-8131, as listed in official Medicare / NPI Registry data.
- What is Michael S. Grenis's NPI number?
- 1669546834. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Michael S. Grenis works
Medicare's Facility Affiliation Data lists Michael S. Grenis at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- University Medical Center of Princeton at PlainsboroPlainsboro, NJ · Acute Care Hospital · CCN 310010
Practice locations
Addresses where Michael S. Grenis is enrolled with Medicare (CMS data updated 2026-10-02).
- 11 Centre DrMonroe Twp, NJ 08831 (609) 924‑8131
- 2000 Westinghouse DrCranberry Township, PA 16066
- 2000 Westinghouse Dr, Suite 200Cranberry Twp, PA 16066
- 325 Princeton AvePrinceton, NJ 08540 (609) 924‑8131
Group practices
Medicare enrollment lists Michael S. Grenis as a member of these groups (CMS data updated 2026-10-02).
- Phoenix Rehabilitation and Health Services Inc2,800 clinicians in the group
- Orthonj LLC304 clinicians in the group
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in New Jersey
Clinicians with the same Medicare primary specialty in New Jersey — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | New York Medical College |
| Graduation year | 1984 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1669546834 |
| 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