William Madison Coburn, M.D.
Internal Medicine Physician · Thousand Oaks, CA
William Madison Coburn, M.D. is an internal medicine physician with a practice address in Thousand Oaks, California, and NPI 1144336983, issued on Aug 22, 2006. Check the license (California C23131, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- William Madison Coburn
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- C23131 CA
Self-reported in NPPES; status is on the state search - Practice location
- 331 S Moorpark RD, Thousand Oaks, CA 91361
- Phone
- (805) 495-0455
- Enumerated
- Aug 22, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (805) 495-3653
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 331 S Moorpark RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Madison Coburn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C23131Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
William Madison Coburn among 17,696 internal medicine physician records in California
William Madison Coburn, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileNo · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2007 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
62 internal medicine physician records list a practice address in Thousand Oaks
They are 62 of the 2,434 NPPES records with a practice address in Thousand Oaks, and 17,696 internal medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 17,696 in California → Every provider in Thousand Oaks → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mandana Azar, M.D.Thousand Oaks, CA 913611851612402
- Christine Dahlin, M.D.Westlake Village, CA 913611922293786
- Anil Daya, M.D.Westlake Village, CA 913611770542722
- Rauz Eshraghi, M.D.Westlake Village, CA 913611619109378
- Zoya Furman, M.D.Thousand Oaks, CA 913611083635205
- Linda Gerrits, MDWestlake Village, CA 913611598875072
- Jigar Ghelani, MDThousand Oaks, CA 913611699823609
- Dana Howard, MDWestlake Village, CA 913611932392792
Common questions
What is William Madison Coburn, M.D.'s NPI number?
William Madison Coburn, M.D.'s National Provider Identifier (NPI) is 1144336983, issued on Aug 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Madison Coburn, M.D. located?
The NPPES record lists a practice address at 331 S Moorpark RD, Thousand Oaks, CA, 91361. Phone: (805) 495-0455. Providers update this record themselves, so call before visiting.
How can I verify William Madison Coburn, M.D.'s license?
NPPES lists California license number C23131, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.