Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Mark Jay McGillem, MD

Individual provider Internal Medicine Physician · NPI 1700877339

Dr. Mark Jay McGillem, MD is an Internal Medicine Physician in Mishawaka, Indiana. Licensed in Indiana. Registered with an NPI since 2005.

Licensed in
IN
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

5215 Holy Cross Pkwy
Mishawaka, IN 46545-1469 Not confirmed with CMS for 14 years — call before visiting
Phone: (574) 335-2521
Fax: (574) 335-2262
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 01051194A (IN)

Record details

NPI number1700877339
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 2, 2005
Last updated in NPPESMarch 15, 2012

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients163
Services billed 171 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

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