Quick answers
- Which hospitals does James M. Diener work at?
- Medicare's official clinician data lists James M. Diener at 5 hospitals: Corewell Health Reed City Hospital, Munson Healthcare Cadillac Hospital, Munson Healthcare Grayling Hospital, Munson Healthcare Otsego Memorial Hospital and Munson Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does James M. Diener see patients?
- Medicare's clinician data lists 1 practice location in Cadillac, MI. Call before your visit to confirm the address.
- What is James M. Diener's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does James M. Diener accept Medicare assignment?
- Yes. Medicare's clinician data says James M. Diener 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 James M. Diener?
- (231) 876-6200, as listed in official Medicare / NPI Registry data.
- What is James M. Diener's NPI number?
- 1588004915. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where James M. Diener works
Medicare's Facility Affiliation Data lists James M. Diener at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Corewell Health Reed City HospitalReed City, MI · Critical Access Hospital · CCN 231323
- Munson Healthcare Cadillac HospitalCadillac, MI · Acute Care Hospital · CCN 230081
- Munson Healthcare Grayling HospitalGrayling, MI · Acute Care Hospital · CCN 230058
- Munson Healthcare Otsego Memorial HospitalGaylord, MI · Acute Care Hospital · CCN 230133
- Munson Medical CenterTraverse City, MI · Acute Care Hospital · CCN 230097
Practice locations
Addresses where James M. Diener is enrolled with Medicare (CMS data updated 2026-10-02).
- 7985 S Mackinaw Trl, Mhc ObgynCadillac, MI 49601 (231) 876‑6200
Group practices
Medicare enrollment lists James M. Diener as a member of this group (CMS data updated 2026-10-02).
- Munson Healthcare Cadillac103 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Michigan
Clinicians with the same Medicare primary specialty in Michigan — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Michigan State University College Of Osteopathic Medicine |
| Graduation year | 2013 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1588004915 |
| 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