MR. WILLIAM RICHARD WHITTEN JR.
NPI 1891022257
Technician/Technologist - Ophthalmic in San Francisco, CA
NPI Status: Active since November 05, 2009
Contact Information
4150 CLEMENT ST
SAN FRANCISCO, CA
ZIP 94121
Phone: (415) 221-4810
Fax: (415) 379-5590
- Individual
- Male
- Technician/Technologist
- Ophthalmic
About WILLIAM WHITTEN
This page provides the complete NPI Profile along with additional information for William Whitten, a provider established in San Francisco, California with a medical specialization in Technician/technologist, focusing in ophthalmic . The healthcare provider is registered in the NPI registry with number 1891022257 assigned on November 2009. The practitioner's primary taxonomy code is 156FX1100X. The provider is registered as an individual and his NPI record was last updated 17 years ago.
- NPI
- 1891022257
- Provider Name
- MR. WILLIAM RICHARD WHITTEN JR.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 4150 CLEMENT ST SAN FRANCISCO, CA 94121
- Location Phone
- (415) 221-4810
- Location Fax
- (415) 379-5590
- Mailing Address
- 4150 CLEMENT ST SAN FRANCISCO, CA 94121
- Mailing Phone
- (415) 221-4810
- Mailing Fax
- (415) 379-5590
- Is Sole Proprietor?
- No
- Enumeration Date
- 11-05-2009
- Last Update Date
- 11-05-2009
- 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
Technician/Technologist Ophthalmic
- Taxonomy Code
- 156FX1100X
- Type
- Eye and Vision Services Providers
- Taxonomy Description
- An ophthalmic technician/technologist assists ophthalmologists by performing ophthalmic clinical functions, including administering eye exams, administering eye medications, and instructing the patient in care and use of corrective lenses.
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NPI 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 1891022257, we treat the final digit (7) 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 53. The final step is to find the difference between that total and the next multiple of ten (60 - 53 = 7).
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 53 is 60. The difference is the calculated check digit.
Other Providers at the Same Location
The following 20 providers are registered at the same or a nearby location.
SAN FRANCISCO, CA 94121
SAN FRANCISCO, CA 94121
SAN FRANCISCO, CA 94121
SAN FRANCISCO, CA 94121
SAN FRANCISCO, CA 94121
SAN FRANCISCO, CA 94121
SAN FRANCISCO, CA 94121
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1891022257, enumerated as an "individual" on November 05, 2009.
The provider is located at 4150 CLEMENT ST SAN FRANCISCO, CA 94121 and the phone number is (415) 221-4810.
Technician/Technologist with taxonomy code 156FX1100X and a focus in Ophthalmic.
