Quick answers
- Which hospitals does Gregory H. Downer work at?
- Medicare's official clinician data lists Gregory H. Downer at 5 hospitals: Corewell Health Gerber Hospital, Corewell Health Ludington Hospital, Mercy Health Lakeshore Campus, Spectrum Health and Trinity Health Muskegon Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory H. Downer see patients?
- Medicare's clinician data lists 1 practice location in Muskegon, MI. Call before your visit to confirm the address.
- What is Gregory H. Downer's specialty?
- Medicare lists Nephrology as the primary specialty, and also Internal Medicine.
- Does Gregory H. Downer accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory H. Downer 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 Gregory H. Downer?
- (231) 733-1912, as listed in official Medicare / NPI Registry data.
- What is Gregory H. Downer's NPI number?
- 1285635367. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory H. Downer works
Medicare's Facility Affiliation Data lists Gregory H. Downer at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Corewell Health Gerber HospitalFremont, MI · Critical Access Hospital · CCN 231338
- Corewell Health Ludington HospitalLudington, MI · Acute Care Hospital · CCN 230110
- Mercy Health Lakeshore CampusShelby, MI · Critical Access Hospital · CCN 231320
- Spectrum HealthGrand Rapids, MI · Acute Care Hospital · CCN 230038
- Trinity Health Muskegon HospitalMuskegon, MI · Acute Care Hospital · CCN 230066
Practice locations
Addresses where Gregory H. Downer is enrolled with Medicare (CMS data updated 2026-10-02).
- 1250 Mercy Dr, Suite 101Muskegon, MI 49444 (231) 733‑1912
Group practices
Medicare enrollment lists Gregory H. Downer as a member of this group (CMS data updated 2026-10-02).
- West Michigan Nephrology PLLC8 clinicians in the group
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in Muskegon
Clinicians with the same Medicare primary specialty in Muskegon, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Indiana University School Of Medicine |
| Graduation year | 1981 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1285635367 |
| 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