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

Stephen Michael Brennan, MD

Individual provider Internal Medicine Physician · NPI 1588168025

Stephen Michael Brennan, MD is a Psychiatry in Oconomowoc, Wisconsin. Graduated from Medical College of Wisconsin in 2018, 8 years ago. Practices with Rogers Memorial Hospital Incorporated, a 45-clinician group. Licensed in Iowa and Wisconsin.

Years since qualifying
8
Trained at
Medical College of Wisconsin
Licensed in
IA, WI
In the registry since
2018
Specialties on file
3
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

1230 Corporate Center Dr Ste 400
Oconomowoc, WI 53066-4883
Phone: (262) 646-6311
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 81856 (WI)
Internal Medicine Physician Taxonomy 207R00000X · Licence 81856 (IA)
Psychiatry Physician Taxonomy 2084P0800X · Licence 81856 (IA)

Record details

NPI number1588168025
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMarch 20, 2018
Last updated in NPPESJanuary 11, 2024
Certification dateJanuary 11, 2024
Mailing address34700 Valley Rd, Oconomowoc, WI 53066-4500

Medicare enrollment

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

Medicare specialtyPSYCHIATRY
Also practisesINTERNAL MEDICINE
Medical schoolMEDICAL COLLEGE OF WISCONSIN
Graduated 2018 (8 years in practice)
Group practice Rogers Memorial Hospital Incorporated — 45 clinicians
Accepts Medicare assignment Not indicated

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