William Brennan, MD
Psychiatry Physician · Westbrook, ME
William Brennan, MD is a psychiatry physician with a practice address in Westbrook, Maine, and NPI 1700861028, issued on Dec 9, 2005. Check the license (Maine MD15334, as entered in NPPES) on the Maine Board of Licensure in Medicine; the Medicare figures below come from public CMS files.
- Name
- William Brennan
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- MD15334 ME
Self-reported in NPPES; status is on the state search - Practice location
- 123 Andover RD, Westbrook, ME 04092
- Phone
- (207) 761-2200
- Enumerated
- Dec 9, 2005
- Entity
- Type 1 · individual
Also registered at 123 Andover RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Anita Ancic, PA-CPhysician Assistant1538470364
- Nancy AshbaughClinical Social Worker1053956854
- Kelli Baldrick, M.D.Psychiatry Physician1609092105
- Ellen Bell, OTOccupational Therapist1154868800
- Rachel Bossi, MSOT, OTR/LPediatric Occupational Therapist1609545250
- Melissa Bowker-Kinley, MDChild & Adolescent Psychiatry Physician1306811799
Verify William Brennan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaine Board of Licensure in Medicine
Search for license MD15334Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
96% fewer Medicare Part D claims than the average psychiatry physician in 2024
37 Medicare Part D claims, against an average of 1,010 among the 32,287 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
The Medicare quality score for 2023: 98.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
22 psychiatry physician records list a Westbrook practice address
They are 22 of the 559 NPPES records with a Westbrook practice address, and 329 psychiatry physician records in Maine.
All 22 in Westbrook → All 329 in Maine → Every provider in Westbrook →
Other psychiatry physician records in Maine
- Kathleen Abernathy, M.D.Yarmouth, ME1013169481
- Mac Abernathy, M.D.Rockport, ME1093009219
- Andres Abreu, MDSouth Portland, ME1871939710
- Stephen Adams, D.O.Augusta, ME1548352768
- Deepika Agrawal, M.D.Waterville, ME1689773079
- Arlene Almazan, MDSkowhegan, ME1053426387
- Vijay Amarendran, MDBrewer, ME1669660015
- Robert Anderson, MDWaterville, ME1073535530
- Hilary Andrew, MDPortland, ME1902177272
- Nicholas Anthony, MDBangor, ME1598261737
Common questions
What is William Brennan, MD's NPI number?
William Brennan, MD's National Provider Identifier (NPI) is 1700861028, issued on Dec 9, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William Brennan, MD located?
The NPPES record lists a practice address at 123 Andover RD, Westbrook, ME, 04092. Phone: (207) 761-2200. Providers update this record themselves, so call before visiting.
How can I verify William Brennan, MD's license?
NPPES lists Maine license number MD15334, as entered by the provider. Search the Maine Board of Licensure in Medicine at https://www.maine.gov/md/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Brennan, MD prescribe under Medicare Part D?
In 2024, William Brennan, MD had 37 Medicare Part D claims; the average among psychiatry physician prescribers was 1,010. Part D covers Medicare prescriptions only.
What is William Brennan, MD's Medicare quality score?
The 2023 MIPS final score is 98.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.