Quick answers
- Which hospitals does Mark Greenberg work at?
- Medicare's official clinician data lists Mark Greenberg at 3 hospitals: Conway Medical Center, Corewell Health Watervliet Hospital and Lakeland Hospital, St Joseph. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark Greenberg see patients?
- Medicare's clinician data lists 1 practice location in Saint Joseph, MI. Call before your visit to confirm the address.
- What is Mark Greenberg's specialty?
- Medicare lists Rheumatology as the primary specialty.
- Does Mark Greenberg accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Greenberg 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 Mark Greenberg?
- (269) 408-1600, as listed in official Medicare / NPI Registry data.
- What is Mark Greenberg's NPI number?
- 1992757405. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark Greenberg works
Medicare's Facility Affiliation Data lists Mark Greenberg at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Conway Medical CenterConway, SC · Acute Care Hospital · CCN 420049
- Corewell Health Watervliet HospitalWatervliet, MI · Acute Care Hospital · CCN 230078
- Lakeland Hospital, St JosephSt Joseph, MI · Acute Care Hospital · CCN 230021
Practice locations
Addresses where Mark Greenberg is enrolled with Medicare (CMS data updated 2026-10-02).
- 3950 Hollywood Rd, Suite 288Saint Joseph, MI 49085 (269) 408‑1600
Group practices
Medicare enrollment lists Mark Greenberg as a member of this group (CMS data updated 2026-10-02).
- Lakeland Medical Practices281 clinicians in the group
Specialties
- Rheumatologyprimary
Other rheumatologists in Michigan
Clinicians with the same Medicare primary specialty in Michigan — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1978 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1992757405 |
| 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