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

Individual provider Internal Medicine Physician · NPI 1578547063

Dr. Michael Jon Sommerfeld, MD is an Internal Medicine in Lake Forest, Illinois. Graduated from R Franklin University of Med & SCI/Chicago Medical School in 1999, 27 years ago. Practices with Endeavor Health Medical Group, a 3,348-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
27
Trained at
R Franklin University of Med & SCI/Chicago Medical School
Licensed in
IL
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

915 S Waukegan Rd Ste 200
Lake Forest, IL 60045-2654
Phone: (224) 516-4108
Fax: (224) 516-4116
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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 036105987 (IL)

Record details

NPI number1578547063
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 30, 2005
Last updated in NPPESJune 17, 2026
Certification dateJune 17, 2026
Mailing address2650 Ridge Ave Ste 1223, Evanston, IL 60201-1700

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolR FRANKLIN UNIVERSITY OF MED & SCI/CHICAGO MEDICAL SCHOOL
Graduated 1999 (27 years in practice)
Group practice Endeavor Health Medical Group — 3348 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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