Quick answers
- Which hospitals does John A. Merchun work at?
- Medicare's official clinician data lists John A. Merchun at 5 hospitals: Corewell Health Big Rapids Hospital, Corewell Health Ludington Hospital, Lakeland Hospital, St Joseph, Spectrum Health and Spectrum Health United Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John A. Merchun see patients?
- Medicare's clinician data lists 4 practice locations, including Grand Rapids, MI, Greenville, MI and Rockford, MI. Call before your visit to confirm the address.
- What is John A. Merchun's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does John A. Merchun accept Medicare assignment?
- Yes. Medicare's clinician data says John A. Merchun 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 John A. Merchun?
- (616) 363-7272, as listed in official Medicare / NPI Registry data.
- What is John A. Merchun's NPI number?
- 1851325971. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John A. Merchun works
Medicare's Facility Affiliation Data lists John A. Merchun at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Corewell Health Big Rapids HospitalBig Rapids, MI · Acute Care Hospital · CCN 230093
- Corewell Health Ludington HospitalLudington, MI · Acute Care Hospital · CCN 230110
- Lakeland Hospital, St JosephSt Joseph, MI · Acute Care Hospital · CCN 230021
- Spectrum HealthGrand Rapids, MI · Acute Care Hospital · CCN 230038
- Spectrum Health United HospitalGreenville, MI · Acute Care Hospital · CCN 230035
Practice locations
Addresses where John A. Merchun is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 Michigan Ave NEGrand Rapids, MI 49503 (616) 363‑7272
- 615 S Bower StGreenville, MI 48838 (616) 363‑7272
- 705 S Greenville W Dr, ImagingGreenville, MI 48838 (616) 574‑3001
- 7160 Cuesta Way Dr NERockford, MI 49341 (616) 363‑7272
Group practices
Medicare enrollment lists John A. Merchun as a member of these groups (CMS data updated 2026-10-02).
- Advanced Radiology Services PC253 clinicians in the group
- Spectrum Health United92 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Grand Rapids
Clinicians with the same Medicare primary specialty in Grand Rapids, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Michigan State University College Of Human Medicine |
| Graduation year | 1993 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1851325971 |
| 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