Thomas D. Brennan, MD
Obstetrics & Gynecology Physician · Portland, OR
Thomas D. Brennan, MD is an obstetrics & gynecology physician with a practice address in Portland, Oregon, and NPI 1831539634, issued on Jun 26, 2013. Check the license (Oregon MD191851, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Thomas D. Brennan
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- MD191851 OR
Self-reported in NPPES; status is on the state search - Practice location
- 9701 SW Barnes RD Ste 200, Portland, OR 97225
- Phone
- (503) 734-3700
- Enumerated
- Jun 26, 2013
- Record last updated
- Jan 28, 2026
- Fax
- (503) 473-8462
- Medicaid ID
- 500689019 OR
- Medicare enrollment
- Enrolled (PECOS I20191122000425); accepts Medicare assignment
- Medical or professional school
- Oregon Health Sciences University School Of Medicine, 2015
- Entity
- Type 1 · individual
Also registered at 9701 SW Barnes RD Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jennifer Bishop, CNMAdvanced Practice Midwife1982097945
- Marni Carlyle, MDObstetrics & Gynecology Physician1245213834
- Rhonda Chick, CNMAdvanced Practice Midwife1265534952
- Kendra Elliott Green, DNP, CNMAdvanced Practice Midwife1114510179
- Sarah Fausel, MDObstetrics & Gynecology Physician1124426952
- Diana Fitzpatrick, MDObstetrics & Gynecology Physician1831280304
Verify Thomas D. Brennan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD191851Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
36% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
105 Medicare Part D claims for 35 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Estradiol27 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.
Industry payments in 2024: $64.79
2 payments; by number, the most common kind was food and beverage; the largest payer was Hologic Sales and Service, LLC. The 21,429 providers of this specialty with any payment received $1,030.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Womens Healthcare Associates LLCPortland, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Obstetrics & Gynecology Physician providers in Oregon
There are 654 obstetrics & gynecology physician records in Oregon.
Other obstetrics & gynecology physician records in Oregon
- Heather Abe, DOBeaverton, OR1265745947
- Diana Ackerman, M.D.Bend, OR1518910710
- Samantha Adkins, MDMilwaukie, OR1790905164
- Michael Adler, MDNewport, OR1033100532
- Elaine Adsit, MDHood River, OR1427048214
- Mary Afsari-Howard, D.O.Portland, OR1356500821
- Asma Ahmad, MDPortland, OR1366466500
- Mary Ann Ahmed, M.D.Bend, OR1265436851
- Stephanie Ahmed, MDPortland, OR1447269170
- Shashi Ajmani, MDRedmond, OR1740255504
Common questions
What is Thomas D. Brennan, MD's NPI number?
Thomas D. Brennan, MD's National Provider Identifier (NPI) is 1831539634, issued on Jun 26, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Thomas D. Brennan, MD located?
The NPPES record lists a practice address at 9701 SW Barnes RD Ste 200, Portland, OR, 97225. Phone: (503) 734-3700. Providers update this record themselves, so call before visiting.
How can I verify Thomas D. Brennan, MD's license?
NPPES lists Oregon license number MD191851, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thomas D. Brennan, MD prescribe under Medicare Part D?
In 2024, Thomas D. Brennan, MD had 105 Medicare Part D claims for 35 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.