Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. James Matthew Diener, DO

Individual provider Internal Medicine Physician · NPI 1588004915

Dr. James Matthew Diener, DO is an Internal Medicine in Cadillac, Michigan. Graduated from Michigan State University College of Osteopathic Medicine in 2013, 13 years ago. Practices with Munson Healthcare Cadillac, a 103-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Michigan.

Years since qualifying
13
Trained at
Michigan State University College of Osteopathic Medicine
Licensed in
MI
In the registry since
2013
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

7985 S Mackinaw Trl
Cadillac, MI 49601-8111
Phone: (231) 779-0320
Fax: (231) 779-1367
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 100 N Roland St, Mc Bain, MI 49657-9683 — (231) 825-8101

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 5101020738 (MI)

Record details

NPI number1588004915
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedJune 29, 2013
Last updated in NPPESNovember 23, 2020
Certification dateNovember 23, 2020

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolMICHIGAN STATE UNIVERSITY COLLEGE OF OSTEOPATHIC MEDICINE
Graduated 2013 (13 years in practice)
Group practice Munson Healthcare Cadillac — 103 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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