Stephen Michael Brennan, MD
Psychiatry Physician · Oconomowoc, WI
Stephen Michael Brennan, MD is a psychiatry physician with a practice address in Oconomowoc, Wisconsin, and NPI 1588168025, issued on Mar 20, 2018. Check the license (Wisconsin 81856, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Stephen Michael Brennan
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License numbers
- 81856 WI
81856 IA
Self-reported in NPPES; status is on the state search - Practice location
- 1230 Corporate Center Dr Ste 400, Oconomowoc, WI 53066
- Phone
- (262) 646-6311
- Enumerated
- Mar 20, 2018
- Record last updated
- Jan 11, 2024
- Medicare enrollment
- Enrolled (PECOS I20231211001849); may accept Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 2018
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 929 in Wisconsin → Look up another NPI →
Verify Stephen Michael Brennan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 81856Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average psychiatry physician in 2024
99 Medicare Part D claims for 20 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
Most prescribed
- Trazodone Hcl12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Rogers Memorial Hospital IncorporatedOconomowoc, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen Michael Brennan among 929 psychiatry physician records in Wisconsin
Stephen Michael Brennan, MD is one of 929 psychiatry physician records with a practice address in Wisconsin. 68% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 85% of them.
- NPI issued2018 · 85% of these records are older, 13% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileYes · 47% of these records are
- Graduated2018 · median 2005 among the 439 with a school on file
- Record last updated2024 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
10 psychiatry physician records list a practice address in Oconomowoc
They are 10 of the 506 NPPES records with a practice address in Oconomowoc, and 929 psychiatry physician records in Wisconsin.
All 929 in Wisconsin → Every provider in Oconomowoc → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Samuel Hall, MDOconomowoc, WI 530661215497037
- Jerry Halverson, MDOconomowoc, WI 530661952360422
- Elizabeth Hamlin, MDOconomowoc, WI 530661134418981
- Sharon Hirsch, M.D.Oconomowoc, WI 530661730208406
- Kathy Kowalke, MDSummit, WI 530661407800774
- Jody Langford, M.D.Oconomowoc, WI 530661679745640
- Tim Levenhagen, MDOconomowoc, WI 530661962487256
- Nicholas MahoneyOconomowoc, WI 530661275929051
Common questions
What is Stephen Michael Brennan, MD's NPI number?
Stephen Michael Brennan, MD's National Provider Identifier (NPI) is 1588168025, issued on Mar 20, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Stephen Michael Brennan, MD located?
The NPPES record lists a practice address at 1230 Corporate Center Dr Ste 400, Oconomowoc, WI, 53066. Phone: (262) 646-6311. Providers update this record themselves, so call before visiting.
How can I verify Stephen Michael Brennan, MD's license?
NPPES lists Wisconsin license number 81856, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Stephen Michael Brennan, MD prescribe under Medicare Part D?
In 2024, Stephen Michael Brennan, MD had 99 Medicare Part D claims for 20 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.