James Roy Vasser, M.D.
Cytopathology Physician · Vallejo, CA
James Roy Vasser, M.D. is a cytopathology physician with a practice address in Vallejo, California, and NPI 1417085960, issued on Feb 28, 2007. Check the license (California A42628, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- James Roy Vasser
- Credential
- M.D.
- Primary taxonomy
- Cytopathology Physician 207ZC0500X
- License number
- A42628 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Hospital Dr, Vallejo, CA 94589
- Phone
- (707) 554-5331
- Enumerated
- Feb 28, 2007
- Record last updated
- Sep 11, 2025
- Fax
- (707) 642-1095
- Entity
- Type 1 · individual
8 nearest cytopathology physician records → All 75 in California → Look up another NPI →
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Verify James Roy Vasser in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A42628Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
James Roy Vasser among 75 cytopathology physician records in California
James Roy Vasser, M.D. is one of 75 cytopathology physician records with a practice address in California. 52% 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 67% of them.
- NPI issued2007 · 67% of these records are older, 19% newer
- In a Medicare fileNo · 52% of these records are
- In the CMS Doctors and Clinicians fileNo · 37% of these records are
- Record last updated2025 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207ZC0500X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cytopathology Physician providers in California
There are 75 cytopathology physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 75 in California → Every provider in Vallejo → Cytopathology Physician nationwide →
The 8 cytopathology physician records with the nearest ZIP codes
- Carl Critz, MDSan Ramon, CA 945831740232107
- Nupoor Gajjar, MDOakland, CA 946091023070265
- Abebe Teklu, M.D.Oakland, CA 946111629449467
- Gloria Yu, MDOakland, CA 946181881891646
- Keegan Lyons, MD MPHTravis Afb, CA 945351720060577
- Quinlan Carlson, MDStanford, CA 943051740925312
- Tamao Setaka Golub, MDStanford, CA 943051568044170
- Sarah Calkins, M.D.San Francisco, CA 941431073848503
Common questions
What is James Roy Vasser, M.D.'s NPI number?
James Roy Vasser, M.D.'s National Provider Identifier (NPI) is 1417085960, issued on Feb 28, 2007. An NPI identifies a provider in billing; it is not a license.
Where is James Roy Vasser, M.D. located?
The NPPES record lists a practice address at 300 Hospital Dr, Vallejo, CA, 94589. Phone: (707) 554-5331. Providers update this record themselves, so call before visiting.
How can I verify James Roy Vasser, M.D.'s license?
NPPES lists California license number A42628, 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.