WILLIAM ON DDS
NPI 1013562586
Dentist - Endodontics in Palo Alto, CA
NPI Status: Active since August 01, 2019
Contact Information
420 CAMBRIDGE AVE STE 5
PALO ALTO, CA
ZIP 94306
Phone: (650) 328-3636
- Individual
- Male
- Dentist
- Endodontics
About WILLIAM ON
This page provides the complete NPI Profile along with additional information for William On, a provider established in Palo Alto, California with a medical specialization in Dentist, focusing in endodontics . The healthcare provider is registered in the NPI registry with number 1013562586 assigned on August 2019. The practitioner's primary taxonomy code is 1223E0200X with license number 103641 (CA). The provider is registered as an individual and his NPI record was last updated February 2026.
- NPI
- 1013562586
- Provider Name
- WILLIAM ON DDS
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 420 CAMBRIDGE AVE STE 5 PALO ALTO, CA 94306
- Location Phone
- (650) 328-3636
- Mailing Address
- 420 CAMBRIDGE AVE STE 5 PALO ALTO, CA 94306
- Mailing Phone
- (408) 328-3636
- Is Sole Proprietor?
- No
- Enumeration Date
- 08-01-2019
- Last Update Date
- 02-18-2026
- Code Navigator
A dentist like William On is a skilled in and licensed provider that diagnoses and treats problems with patients teeth, gums, and related parts of the mouth. Dentists educate patients on how to take care of the teeth and gums and provide information on diet choices that affect oral health. Dentists must be licensed in the state in which they work.
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
Dentist Endodontics
- Taxonomy Code
- 1223E0200X
- Type
- Dental Providers
- License No.
- 103641
- License State
- CA
- Taxonomy Description
- The branch of dentistry that is concerned with the morphology, physiology and pathology of the human dental pulp and periradicular tissues. Its study and practice encompass the basic and clinical sciences including biology of the normal pulp, the etiology, diagnosis, prevention and treatment of diseases and injuries of the pulp and associated periradicular conditions.
Reviews for WILLIAM ON DDS
There are currently no reviews for this provider. Be the first person to share your experience with this provider by filling out our review form. Your insights are appreciated and will help others make informed decisions.
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 1013562586, we treat the final digit (6) 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 54. The final step is to find the difference between that total and the next multiple of ten (60 - 54 = 6).
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 54 is 60. The difference is the calculated check digit.
Other Providers at the Same Location
The following 2 providers are registered at the same or a nearby location.
PALO ALTO, CA 94306
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1013562586, enumerated as an "individual" on August 01, 2019.
The provider is located at 420 CAMBRIDGE AVE STE 5 PALO ALTO, CA 94306 and the phone number is (650) 328-3636.
Dentist with taxonomy code 1223E0200X and a focus in Endodontics.
