Active NPI
James Roy Vasser, M.D.
- Cytopathology Physician
- Vallejo, CA
National Provider Identifier
1417085960
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Cytopathology Physician
- License
- A42628
- Practice address
- 300 Hospital Dr
Department of Pathology
Vallejo, CA 94589-2574 - Phone
- (707) 554-5331
- Fax
- (707) 642-1095
- NPI assigned
- Feb 28, 2007
- Sex
- Male
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 2
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Cytopathology Physician | 207ZC0500X | A42628 | CA | Primary |
| Anatomic Pathology & Clinical Pathology Physician | 207ZP0102X | A42628 | CA |
Addresses
Primary practice location
300 Hospital Dr
Department of Pathology
Vallejo, CA 94589-2574
Mailing address
300 Hospital Drive
Department of Pathology
Vallejo, CA 94589
Phone (707) 554-5331
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Not enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| A42628 | CA | MD | Cytopathology Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1172620800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1757548800000",
"number": "1417085960",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "300 HOSPITAL DRIVE",
"address_2": "DEPARTMENT OF PATHOLOGY",
"city": "VALLEJO",
"state": "CA",
"postal_code": "94589",
"telephone_number": "707-554-5331",
"fax_number": "707-642-1095"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "300 HOSPITAL DR",
"address_2": "DEPARTMENT OF PATHOLOGY",
"city": "VALLEJO",
"state": "CA",
"postal_code": "945892574",
"telephone_number": "707-554-5331",
"fax_number": "707-642-1095"
}
],
"practiceLocations": [],
"basic": {
"last_name": "VASSER",
"first_name": "JAMES",
"middle_name": "ROY",
"credential": "M.D.",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2007-02-28",
"last_updated": "2025-09-11",
"status": "A"
},
"taxonomies": [
{
"code": "207ZC0500X",
"taxonomy_group": "",
"desc": "Pathology, Cytopathology",
"state": "CA",
"license": "A42628",
"primary": true
},
{
"code": "207ZP0102X",
"taxonomy_group": "",
"desc": "Pathology, Anatomic Pathology & Clinical Pathology",
"state": "CA",
"license": "A42628",
"primary": false
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Vallejo, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.