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

Michael Casmir Kowalczyk, DO

Individual provider Internal Medicine Physician · NPI 1649277211

Michael Casmir Kowalczyk, DO is an Internal Medicine in Lansing, Michigan. Graduated from Michigan State University College of Osteopathic Medicine in 1988, 38 years ago. Practices with Eaton Rapids Medical Center, a 36-clinician group and accepts Medicare assignment. Licensed in Michigan.

Years since qualifying
38
Trained at
Michigan State University College of Osteopathic Medicine
Licensed in
MI
In the registry since
2005
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

3955 Patient Care Dr Ste A
Lansing, MI 48911-4271
Phone: (517) 374-7600
Fax: (885) 480-9150
Show map & directions

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

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MK010436 (MI)

Record details

NPI number1649277211
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 28, 2005
Last updated in NPPESMarch 18, 2025
Certification dateMarch 18, 2025
Mailing address3955 Patient Care Dr Ste A, Lansing, MI 48911-4271

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 1988 (38 years in practice)
Group practice Eaton Rapids Medical Center — 36 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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