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

Dr. Brian J Lenahan, DO

Individual provider Family Medicine Physician · NPI 1053462788

Dr. Brian J Lenahan, DO is registered under Family Practice in Naperville, Illinois. Graduated from Midwestern University, Chicago College of Osteopathic Med in 2003, 23 years ago. Practices with Northwestern Medical Faculty Foundation, a 4,394-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
23
Trained at
Midwestern University, Chicago College of Osteopathic Med
Licensed in
IL
In the registry since
2007
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

4003 S Route 59
Naperville, IL 60564-5802
Phone: (888) 693-6437
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 885 Roosevelt Rd Ste 100, Glen Ellyn, IL 60137-6141 — (630) 384-6200

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 036114526 (IL)

Record details

NPI number1053462788
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJanuary 16, 2007
Last updated in NPPESFebruary 26, 2024
Certification dateFebruary 26, 2024

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolMIDWESTERN UNIVERSITY, CHICAGO COLLEGE OF OSTEOPATHIC MED
Graduated 2003 (23 years in practice)
Group practice Northwestern Medical Faculty Foundation — 4394 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients21
Services billed 31 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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.

Colleagues at Northwestern Medical Faculty Foundation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 4394 clinicians in the practice; 12 are shown here.

Other providers in Naperville