Thomas Sean McBreen, M.D.
Family Medicine Physician · Ventura, CA
Thomas Sean McBreen, M.D. is a family medicine physician with a practice address in Ventura, California, and NPI 1275605578, issued on Nov 14, 2006. Check the license (California G42708, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas Sean McBreen
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- G42708 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2929 Loma Vista RD, Ventura, CA 93003
- Phone
- (805) 653-5741
- Enumerated
- Nov 14, 2006
- Record last updated
- Apr 7, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (805) 653-6829
- Medicare enrollment
- Enrolled (PECOS I20110621000502); may accept Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 1979
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 2929 Loma Vista RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Thomas Sean McBreen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G42708Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% more Medicare Part D claims than the average family medicine physician in 2024
6,025 Medicare Part D claims for 423 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 258 claims were for opioids.
Most prescribed
- Lisinopril331 claims
- Atorvastatin Calcium254 claims
- Levothyroxine Sodium251 claims
- Atenolol182 claims
- Hydrocodone-Acetaminophen174 claims
- Rosuvastatin Calcium165 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 MIPS final score for 2023 (Medicare payment program): 27.5 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).
Thomas Sean McBreen among 17,133 family medicine physician records in California
Thomas Sean McBreen, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1979 · median 2005 among the 10,652 with a school on file
- Record last updated2011 · 58% 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 California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
234 family medicine physician records list a practice address in Ventura
They are 234 of the 4,435 NPPES records with a practice address in Ventura, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Ventura → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Charles Adams, M.D.Ventura, CA 930031811925225
- Veronica Butler, M.D.Ventura, CA 930031063472736
- Eric Chun, M.D.Ventura, CA 930031699702381
- Michelle Daucett, D.O.Ventura, CA 930031003873035
- Derrick Dcosta, M.D.Ventura, CA 930031487699005
- James Hermann, M.D.Ventura, CA 930031861442899
- Theodore Hole, M.D.Ventura, CA 930031104873611
- Andrew Kerr, M.D.Ventura, CA 930031487695078
Common questions
What is Thomas Sean McBreen, M.D.'s NPI number?
Thomas Sean McBreen, M.D.'s National Provider Identifier (NPI) is 1275605578, issued on Nov 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Sean McBreen, M.D. located?
The NPPES record lists a practice address at 2929 Loma Vista RD, Ventura, CA, 93003. Phone: (805) 653-5741. Providers update this record themselves, so call before visiting.
How can I verify Thomas Sean McBreen, M.D.'s license?
NPPES lists California license number G42708, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thomas Sean McBreen, M.D. prescribe under Medicare Part D?
In 2024, Thomas Sean McBreen, M.D. had 6,025 Medicare Part D claims for 423 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Thomas Sean McBreen, M.D.'s MIPS final score?
The 2023 MIPS final score is 27.5 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.