Martin Holt Walker, M.D.
Internal Medicine Physician · Carpinteria, CA
Martin Holt Walker, M.D. is an internal medicine physician with a practice address in Carpinteria, California, and NPI 1548305865, issued on Feb 21, 2007. Check the license (California G 20811, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Martin Holt Walker
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G 20811 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4575 EL Carro LN, Carpinteria, CA 93013
- Phone
- (805) 684-1013
- Enumerated
- Feb 21, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (805) 684-1013
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Martin Holt Walker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G 20811Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Martin Holt Walker among 17,696 internal medicine physician records in California
Martin Holt Walker, 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% 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).
4 internal medicine physician records list a practice address in Carpinteria
They are 4 of the 201 NPPES records with a practice address in Carpinteria, 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 Carpinteria → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- William Edelstein, M.D.Carpinteria, CA 930131073527875
- Todd Engstrom, MDCarpinteria, CA 930131538282587
- Rafael Victoria, M.D.Carpinteria, CA 930131194870220
- Erin Baldwin, MDCamarillo, CA 930121770786881
- Sabrina Barata, MDCamarillo, CA 930121255892923
- David HaddadCamarillo, CA 930121588036438
- F. Halcomb, M.D.Camarillo, CA 930121831542257
- Naser Jamal, D.O.Camarillo, CA 930121104914019
Common questions
What is Martin Holt Walker, M.D.'s NPI number?
Martin Holt Walker, M.D.'s National Provider Identifier (NPI) is 1548305865, issued on Feb 21, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Martin Holt Walker, M.D. located?
The NPPES record lists a practice address at 4575 EL Carro LN, Carpinteria, CA, 93013. Phone: (805) 684-1013. Providers update this record themselves, so call before visiting.
How can I verify Martin Holt Walker, M.D.'s license?
NPPES lists California license number G 20811, 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.