Quick answers
- Which hospitals does Mark C. Antonishen work at?
- Medicare's official clinician data lists Mark C. Antonishen at 3 hospitals: Charlevoix Area Hospital, McLaren Northern Michigan and Munson Healthcare Otsego Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark C. Antonishen see patients?
- Medicare's clinician data lists 2 practice locations, including Boyne City, MI. Call before your visit to confirm the address.
- What is Mark C. Antonishen's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Geriatric Medicine.
- Does Mark C. Antonishen accept Medicare assignment?
- Yes. Medicare's clinician data says Mark C. Antonishen 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 C. Antonishen?
- (231) 582-5314, as listed in official Medicare / NPI Registry data.
- What is Mark C. Antonishen's NPI number?
- 1518971654. 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 C. Antonishen works
Medicare's Facility Affiliation Data lists Mark C. Antonishen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Charlevoix Area HospitalCharlevoix, MI · Critical Access Hospital · CCN 231322
- McLaren Northern MichiganPetoskey, MI · Acute Care Hospital · CCN 230105
- Munson Healthcare Otsego Memorial HospitalGaylord, MI · Acute Care Hospital · CCN 230133
Practice locations
Addresses where Mark C. Antonishen is enrolled with Medicare (CMS data updated 2026-10-02).
- 223 N Park StBoyne City, MI 49712
- 223 N Park St, Charlevoix Area HospitalBoyne City, MI 49712 (231) 582‑5314
Group practices
Medicare enrollment lists Mark C. Antonishen as a member of this group (CMS data updated 2026-10-02).
- Munson Healthcare Charlevoix Hospital56 clinicians in the group
Specialties
- Internal Medicineprimary
- Geriatric Medicinealso
Other internal medicine doctors in Michigan
Clinicians with the same Medicare primary specialty in Michigan — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Wayne State University School Of Medicine |
| Graduation year | 1981 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1518971654 |
| 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