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

Luke James Marcus, DO

Individual provider Internal Medicine Physician · NPI 1972746105

Luke James Marcus, DO practises Internal Medicine in Pontiac, Michigan. Qualified in 2009, 17 years ago. Practices with Mercy Hospitalists, PLLC, a 26-clinician group and accepts Medicare assignment. Licensed in Michigan.

Years since qualifying
17
Licensed in
MI
In the registry since
2009
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.

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Practice location Address checks out

50 N Perry St
Pontiac, MI 48342-2217 Not confirmed with CMS for 14 years — call before visiting
Phone: (248) 338-5516
Fax: (248) 338-5547
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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 5101018125 (MI)

Record details

NPI number1972746105
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedApril 17, 2009
Last updated in NPPESJune 27, 2012

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2009 (17 years in practice)
Group practice Mercy Hospitalists, Pllc — 26 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

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 patients395
Services billed 1,912 a service is one billed item, such as a visit, a test or a procedure
Average patient age78

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Also affiliated with 1 long-term care hospital, which CMS identifies by certification number only.

Colleagues at Mercy Hospitalists, PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 26 clinicians in the practice; 12 are shown here.

Other providers in Pontiac