Kathleen Elizabeth Brennan, M.D.
Family Medicine Physician · Portland, ME
Kathleen Elizabeth Brennan, M.D. is a family medicine physician with a practice address in Portland, Maine, and NPI 1922444900, issued on May 16, 2013. Check the license (Maine MD21275, as entered in NPPES) on the Maine Board of Licensure in Medicine; the Medicare figures below come from public CMS files.
- Name
- Kathleen Elizabeth Brennan
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD21275 ME
Self-reported in NPPES; status is on the state search - Practice location
- 22 Bramhall St, Portland, ME 04102
- Phone
- (207) 662-6562
- Enumerated
- May 16, 2013
- Record last updated
- May 26, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20161121001155); may accept Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2013
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 1,172 in Maine → Look up another NPI →
Also registered at 22 Bramhall St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Haley Acker, PA-CPhysician Assistant1972167377
Verify Kathleen Elizabeth 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 MD21275Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
32% fewer Medicare Part D claims than the average family medicine physician in 2024
2,421 Medicare Part D claims for 258 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 72 claims were for opioids.
Most prescribed
- Atorvastatin Calcium157 claims
- Lisinopril107 claims
- Levothyroxine Sodium102 claims
- Gabapentin93 claims
- Amlodipine Besylate84 claims
- Omeprazole66 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 3 group practices
- MainehealthFalmouth, ME
- Riverview Physical Therapy Limited PartnershipYarmouth, ME
- Select Physical Therapy Holdings IncAuburn, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kathleen Elizabeth Brennan among 1,172 family medicine physician records in Maine
Kathleen Elizabeth Brennan, M.D. is one of 1,172 family medicine physician records with a practice address in Maine. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 68% of them.
- NPI issued2013 · 68% of these records are older, 29% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2013 · median 2008 among the 668 with a school on file
- Record last updated2020 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
89 family medicine physician records list a practice address in Portland
They are 89 of the 6,022 NPPES records with a practice address in Portland, and 1,172 family medicine physician records in Maine.
All 1,172 in Maine → Every provider in Portland → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Maria Atkins, D.O.Portland, ME 041021962522300
- Michael Bedecs, D.O.Portland, ME 041021164569547
- Magili Chapman, D.O.Portland, ME 041021063595148
- Catherine Crute, MDPortland, ME 041021508834441
- Elizabeth Frutiger, MDPortland, ME 041021073596672
- Alison Gorman, M.D.Portland, ME 041021891710844
- Ross Hilliard, M.D.Portland, ME 041021033402276
- Alison Miller, MDPortland, ME 041021578825352
Common questions
What is Kathleen Elizabeth Brennan, M.D.'s NPI number?
Kathleen Elizabeth Brennan, M.D.'s National Provider Identifier (NPI) is 1922444900, issued on May 16, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Kathleen Elizabeth Brennan, M.D. located?
The NPPES record lists a practice address at 22 Bramhall St, Portland, ME, 04102. Phone: (207) 662-6562. Providers update this record themselves, so call before visiting.
How can I verify Kathleen Elizabeth Brennan, M.D.'s license?
NPPES lists Maine license number MD21275, 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 Kathleen Elizabeth Brennan, M.D. prescribe under Medicare Part D?
In 2024, Kathleen Elizabeth Brennan, M.D. had 2,421 Medicare Part D claims for 258 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.