Eric Williamson, MD
Internal Medicine Physician · Travis Afb, CA
Eric Williamson, MD is an internal medicine physician with a practice address in Travis Afb, California, and NPI 1285374108, issued on Mar 30, 2022. Check the license on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Eric Williamson
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 328752 NY
Self-reported in NPPES; status is on the state search - Practice location
- 60 Mdg/sggx, Travis Afb, CA 94535
- Phone
- (707) 423-7342
- Enumerated
- Mar 30, 2022
- Record last updated
- Jul 25, 2025
- Medicare enrollment
- Enrolled (PECOS I20260522001253); may accept Medicare assignment
- Medical or professional school
- New York University School Of Medicine, 2022
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 60 Mdg/sggx
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Eric Williamson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of CaliforniaCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
44 Medicare Part D claims for 18 beneficiaries, against an average of 3,176 among the 108,855 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.
Eric Williamson among 17,696 internal medicine physician records in California
Eric Williamson, MD 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. Its NPI, issued in 2022, is newer than 95% of them.
- NPI issued2022 · 95% of these records are older, 2% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2022 · median 2004 among the 11,065 with a school on file
- Record last updated2025 · 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).
23 internal medicine physician records list a practice address in Travis Afb
They are 23 of the 864 NPPES records with a practice address in Travis Afb, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Travis Afb → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Allan Andres, M.D.Travis Afb, CA 945351114176161
- Myo Chang, MDFairfield, CA 945351003899279
- Maria Conley, MDFairfield, CA 945351093838872
- Christopher Dennis, D.O.Travis Afb, CA 945351780611723
- James Doyle, M.D.Travis Afb, CA 945351316053424
- George Estes, M.D.Travis Afb, CA 945351346332095
- Elizabeth Fernandes, MDFairfield, CA 945351043398134
- Aikkachai Jiras, M.D.Travis Afb, CA 945351225198955
Common questions
What is Eric Williamson, MD's NPI number?
Eric Williamson, MD's National Provider Identifier (NPI) is 1285374108, issued on Mar 30, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Eric Williamson, MD located?
The NPPES record lists a practice address at 60 Mdg/sggx, Travis Afb, CA, 94535. Phone: (707) 423-7342. Providers update this record themselves, so call before visiting.
How can I verify Eric Williamson, MD's license?
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 Eric Williamson, MD prescribe under Medicare Part D?
In 2024, Eric Williamson, MD had 44 Medicare Part D claims for 18 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.