Quick answers
- Which hospitals does Mark W. Armstrong work at?
- Medicare's official clinician data lists Mark W. Armstrong at 2 hospitals: Spectrum Health and Spectrum Health United Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark W. Armstrong see patients?
- Medicare's clinician data lists 6 practice locations, including Grand Rapids, MI, Greenville, MI and Sparta, MI. Call before your visit to confirm the address.
- What is Mark W. Armstrong's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Mark W. Armstrong accept Medicare assignment?
- Yes. Medicare's clinician data says Mark W. Armstrong 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 W. Armstrong?
- (616) 391-1774, as listed in official Medicare / NPI Registry data.
- What is Mark W. Armstrong's NPI number?
- 1932104882. 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 W. Armstrong works
Medicare's Facility Affiliation Data lists Mark W. Armstrong at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Spectrum HealthGrand Rapids, MI · Acute Care Hospital · CCN 230038
- Spectrum Health United HospitalGreenville, MI · Acute Care Hospital · CCN 230035
Practice locations
Addresses where Mark W. Armstrong is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 100 Michigan Ave NEGrand Rapids, MI 49503 (616) 391‑1774
- 100 Michigan St Northeast, Corewell Health Grand Rapids HospitGrand Rapids, MI 49503 (616) 391‑1774
- 1202 W Oak StGreenville, MI 48838
- 2111 12 Mile Rd NW, Corewell Health Medical Group WestSparta, MI 49345
- 2249 Wealthy St SE, 110 Corewell Health Medical Group WestEast Grand Rapids, MI 49506 (616) 391‑4600
Group practices
Medicare enrollment lists Mark W. Armstrong as a member of these groups (CMS data updated 2026-10-02).
- Spectrum Health Primary Care Partners2,294 clinicians in the group
- Spectrum Health Hospitals160 clinicians in the group
- Spectrum Health United92 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Grand Rapids
Clinicians with the same Medicare primary specialty in Grand Rapids, MI — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Michigan State University College Of Osteopathic Medicine |
| Graduation year | 1984 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1932104882 |
| 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