DR. BENJAMIN HENRY VANDERZWAAG M.D.
NPI 1245201805
Radiology - Diagnostic Radiology in Napa, CA
- Individual
- Male
- Radiology
- Diagnostic Radiology
About BENJAMIN VANDERZWAAG
This page provides the complete NPI Profile along with additional information for Benjamin Vanderzwaag, a provider established in Napa, California with a medical specialization in Radiology, focusing in diagnostic radiology . The healthcare provider is registered in the NPI registry with number 1245201805 assigned on January 2006. The practitioner's primary taxonomy code is 2085R0202X with license number C33747 (CA). The provider is registered as an individual and his NPI record was last updated July 2026.
- NPI
- 1245201805
- Provider Name
- DR. BENJAMIN HENRY VANDERZWAAG M.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 575 LINCOLN SUITE 310 NAPA, CA 94558
- Location Phone
- (707) 256-3800
- Location Fax
- (707) 256-3508
- Mailing Address
- 2365 WESTLAKE DR KELSEYVILLE, CA 95451
- Mailing Phone
- (707) 279-2078
- Mailing Fax
- (707) 279-0890
- Is Sole Proprietor?
- No
- Enumeration Date
- 01-31-2006
- Last Update Date
- 07-13-2026
- Code Navigator
Location Map
Specialty - Primary Taxonomy
The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.
- Classification
Radiology Diagnostic Radiology
- Taxonomy Code
- 2085R0202X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- C33747
- License State
- CA
- Taxonomy Description
- A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.
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NPI Number Validation
How NPI Validation Works
The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.
To verify the NPI 1245201805, we treat the final digit (5) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 55. The final step is to find the difference between that total and the next multiple of ten (60 - 55 = 5).
Digit-by-digit view
Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.
Step 1: Double every other digit from the right
Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 55 is 60. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1245201805, enumerated as an "individual" on January 31, 2006.
The provider is located at 575 LINCOLN SUITE 310 NAPA, CA 94558 and the phone number is (707) 256-3800.
Radiology with taxonomy code 2085R0202X and a focus in Diagnostic Radiology.
