Active NPI
Benjamin Henry Vanderzwaag, M.D.
- Diagnostic Radiology Physician
- Napa, CA
National Provider Identifier
1245201805
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Diagnostic Radiology Physician
- License
- C33747
- Practice address
- 575 Lincoln
Suite 310
Napa, CA 94558 - Phone
- (707) 256-3800
- Fax
- (707) 256-3508
- NPI assigned
- Jan 31, 2006
- 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 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Diagnostic Radiology Physician | 2085R0202X | C33747 | CA | Primary |
Addresses
Primary practice location
575 Lincoln
Suite 310
Napa, CA 94558
Mailing address
2365 Westlake Dr
Kelseyville, CA 95451-7055
Phone (707) 279-2078
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)
- Enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| C33747 | CA | MD | Diagnostic Radiology Physician |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Valley Radiological Associates Medical Group, Inc. | Diagnostic Radiology | Past | Accepting new patients |
Organizations & group practices 1
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.
-
- Diagnostic Radiology Physician
- Saint Helena, CA
- NPI 1104881747
Diagnostic Radiology
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1138665600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1245201805",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "2365 WESTLAKE DR",
"city": "KELSEYVILLE",
"state": "CA",
"postal_code": "954517055",
"telephone_number": "707-279-2078",
"fax_number": "707-279-0890"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "575 LINCOLN",
"address_2": "SUITE 310",
"city": "NAPA",
"state": "CA",
"postal_code": "94558",
"telephone_number": "707-256-3800",
"fax_number": "707-256-3508"
}
],
"practiceLocations": [],
"basic": {
"last_name": "VANDERZWAAG",
"first_name": "BENJAMIN",
"middle_name": "HENRY",
"name_prefix": "Dr.",
"credential": "M.D.",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2006-01-31",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "2085R0202X",
"taxonomy_group": "",
"desc": "Radiology, Diagnostic Radiology",
"state": "CA",
"license": "C33747",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Napa, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.