DR. WILLIAM HENRY TONSALL O.D.
NPI 1265584429
Optometrist in Oakland, CA
NPI Status: Active since January 17, 2007
Contact Information
280 W MACARTHUR BLVD
OAKLAND, CA
ZIP 94611
Phone: (510) 752-6665
Fax: (510) 752-1636
- Individual
- Male
- Optometrist
About WILLIAM TONSALL
This page provides the complete NPI Profile along with additional information for William Tonsall, a provider established in Oakland, California with a medical specialization in Optometrist. The healthcare provider is registered in the NPI registry with number 1265584429 assigned on January 2007. The practitioner's primary taxonomy code is 152W00000X with license number 4702 (CA). The provider is registered as an individual and his NPI record was last updated 19 years ago.
- NPI
- 1265584429
- Provider Name
- DR. WILLIAM HENRY TONSALL O.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 280 W MACARTHUR BLVD OAKLAND, CA 94611
- Location Phone
- (510) 752-6665
- Location Fax
- (510) 752-1636
- Mailing Address
- 6310 MACARTHUR BLVD OAKLAND, CA 94605
- Mailing Phone
- (510) 562-7229
- Is Sole Proprietor?
- No
- Enumeration Date
- 01-17-2007
- Last Update Date
- 07-08-2007
- 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
Optometrist
- Taxonomy Code
- 152W00000X
- Type
- Eye and Vision Services Providers
- License No.
- 4702
- License State
- CA
- Taxonomy Description
- Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.
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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 1265584429, we treat the final digit (9) 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 61. The final step is to find the difference between that total and the next multiple of ten (70 - 61 = 9).
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 61 is 70. 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.
OAKLAND, CA 94611
OAKLAND, CA 94611
OAKLAND, CA 94611
OAKLAND, CA 94611
OAKLAND, CA 94611
OAKLAND, CA 94611
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1265584429, enumerated as an "individual" on January 17, 2007.
The provider is located at 280 W MACARTHUR BLVD OAKLAND, CA 94611 and the phone number is (510) 752-6665.
Optometrist with taxonomy code 152W00000X.
