Thomas Barker, M.D.
Family Medicine Physician · Yorba Linda, CA
Thomas Barker, M.D. is a family medicine physician with a practice address in Yorba Linda, California, and NPI 1275574097, issued on Jun 10, 2006. Check the license (California G49616, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas Barker
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- G49616 CA
Self-reported in NPPES; status is on the state search - Practice location
- 18300 Yorba Linda Blvd, Yorba Linda, CA 92886
- Phone
- (714) 577-6000
- Enumerated
- Jun 10, 2006
- Record last updated
- Apr 20, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (714) 572-9538
- Medicaid ID
- 00G496160 CA
- Entity
- Type 1 · individual
Also registered at 18300 Yorba Linda Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jeanette Alves, P.A.Medical Physician Assistant1124189618
- Carl Buckhorn, M.D.Internal Medicine Physician1649264847
- Christina Caputo, PAPhysician Assistant1366771891
- Xandi Craig, P.A.Medical Physician Assistant1285735258
- Gregg Denicola, MDFamily Medicine Physician1164469912
- Kathleen Diesto, RDNutritionist1174730063
Verify Thomas Barker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G49616Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average family medicine physician in 2024
61 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
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.
48 family medicine physician records list a practice address in Yorba Linda
They are 48 of the 748 NPPES records with a practice address in Yorba Linda, and 17,133 family medicine physician records in California.
All 48 in Yorba Linda → All 17,133 in California → Every provider in Yorba Linda →
Other family medicine physician records in California
- Omer Aba-Omer, MDSanta Monica, CA1649702093
- Michelle Ababa, MDWilmington, CA1710922513
- Anna Tzeitel Abalos, MDRoseville, CA1720200017
- Adan Abarca, MDAnaheim, CA1760553689
- Vanessa Abarca, DOVentura, CA1952040859
- Lorraine Abate, M.D.Sacramento, CA1104840008
- Robert Abatecola, MDCastro Valley, CA1669551719
- Romeo Abaya, M.D.Cottonwood, CA1598053506
- Effiem Abbah, MD, MPHSan Francisco, CA1821185133
- Khuzeman Abbasi, MDSanta Rosa, CA1841979952
Common questions
What is Thomas Barker, M.D.'s NPI number?
Thomas Barker, M.D.'s National Provider Identifier (NPI) is 1275574097, issued on Jun 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Barker, M.D. located?
The NPPES record lists a practice address at 18300 Yorba Linda Blvd, Yorba Linda, CA, 92886. Phone: (714) 577-6000. Providers update this record themselves, so call before visiting.
How can I verify Thomas Barker, M.D.'s license?
NPPES lists California license number G49616, 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 Barker, M.D. prescribe under Medicare Part D?
In 2024, Thomas Barker, M.D. had 61 Medicare Part D claims; 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.