Thomas Winfield Keown, MD
Emergency Medicine Physician · Vacaville, CA
Thomas Winfield Keown, MD is an emergency medicine physician with a practice address in Vacaville, California, and NPI 1992368781, issued on Apr 17, 2019. Check the license (California A176080, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas Winfield Keown
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A176080 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1 Quality Dr, Vacaville, CA 95688
- Phone
- (707) 624-2600
- Enumerated
- Apr 17, 2019
- Record last updated
- Jul 12, 2022
- Medicare enrollment
- Enrolled (PECOS I20230206003000); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 1 Quality Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Thomas Winfield Keown in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A176080Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% more Medicare Part D claims than the average emergency medicine physician in 2024
357 Medicare Part D claims for 229 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 38 claims were for opioids.
Most prescribed
- Oxycodone Hcl37 claims
- Ondansetron Odt29 claims
- Cefpodoxime Proxetil25 claims
- Doxycycline Monohydrate24 claims
- Prednisone23 claims
- Cefadroxil19 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
- Permanente Medical Group IncVacaville, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas Winfield Keown among 7,751 emergency medicine physician records in California
Thomas Winfield Keown, MD is one of 7,751 emergency 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 2019, is newer than 85% of them.
- NPI issued2019 · 85% of these records are older, 12% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2019 · median 2011 among the 4,560 with a school on file
- Record last updated2022 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
20 emergency medicine physician records list a practice address in Vacaville
They are 20 of the 1,903 NPPES records with a practice address in Vacaville, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Vacaville → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Maricel Romelia Dela CruzVacaville, CA 956881396004032
- Nathan Finch, MDVacaville, CA 956881578060547
- Melissa Gaspar, MDVacaville, CA 956881588291496
- Anisa Heravian, M.D.Vacaville, CA 956881861768947
- Aileen Jaber, MDVacaville, CA 956881497807614
- Amanda Jackson, MDVacaville, CA 956881386141844
- Joshua Kessack, D.O.Vacaville, CA 956881629503180
- Samuel Kim, M.D.Vacaville, CA 956881528440658
Common questions
What is Thomas Winfield Keown, MD's NPI number?
Thomas Winfield Keown, MD's National Provider Identifier (NPI) is 1992368781, issued on Apr 17, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Winfield Keown, MD located?
The NPPES record lists a practice address at 1 Quality Dr, Vacaville, CA, 95688. Phone: (707) 624-2600. Providers update this record themselves, so call before visiting.
How can I verify Thomas Winfield Keown, MD's license?
NPPES lists California license number A176080, 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 Winfield Keown, MD prescribe under Medicare Part D?
In 2024, Thomas Winfield Keown, MD had 357 Medicare Part D claims for 229 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.