Quick answers
- Where does Stephen M. Brennan see patients?
- Medicare's clinician data lists 1 practice location in Oconomowoc, WI. Call before your visit to confirm the address.
- What is Stephen M. Brennan's specialty?
- Medicare lists Psychiatry as the primary specialty, and also Internal Medicine.
- Does Stephen M. Brennan accept Medicare assignment?
- Medicare's clinician data says Stephen M. Brennan may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is the phone number for Stephen M. Brennan?
- (800) 767-4411, as listed in official Medicare / NPI Registry data.
- What is Stephen M. Brennan's NPI number?
- 1588168025. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Stephen M. Brennan is enrolled with Medicare (CMS data updated 2026-10-02).
- 1205 Corporate Ctr DrOconomowoc, WI 53066 (800) 767‑4411
Group practices
Medicare enrollment lists Stephen M. Brennan as a member of this group (CMS data updated 2026-10-02).
- Rogers Memorial Hospital Incorporated49 clinicians in the group
Specialties
- Psychiatryprimary
- Internal Medicinealso
Other psychiatrists in Oconomowoc
Clinicians with the same Medicare primary specialty in Oconomowoc, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Medical College Of Wisconsin |
| Graduation year | 2018 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1588168025 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians