William On, DDS
Endodontics · Palo Alto, CA
William On, DDS is an endodontics with a practice address in Palo Alto, California, and NPI 1013562586, issued on Aug 1, 2019. Check the license (California 103641, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William On
- Credential
- DDS
- Primary taxonomy
- Endodontics 1223E0200X
- License number
- 103641 CA
Self-reported in NPPES; status is on the state search - Practice location
- 420 Cambridge Ave Ste 5, Palo Alto, CA 94306
- Phone
- (650) 328-3636
- Enumerated
- Aug 1, 2019
- Record last updated
- Feb 18, 2026
- Entity
- Type 1 · individual
8 nearest endodontics records → All 1,018 in California → Look up another NPI →
Also registered at 420 Cambridge Ave Ste 5
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Anna Bowers, DDSEndodontics1487264776
Verify William On in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 103641Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $124.79
2 payments; by number, the most common kind was food and beverage; the largest payer was Carl Zeiss Meditec USA, Inc. The 2,057 providers of this specialty with any payment received $49,739.86 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
William On among 1,018 endodontics records in California
William On, DDS is one of 1,018 endodontics records with a practice address in California. 68% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 93% of them.
- NPI issued2019 · 93% of these records are older, 6% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2026 · 78% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223E0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endodontics providers in California
There are 1,018 endodontics records in California.
All 1,018 in California → Every provider in Palo Alto → Endodontics nationwide →
The 8 endodontics records with the nearest ZIP codes
- Anna Bowers, DDSPalo Alto, CA 943061487264776
- Tri Huynh, D.D.S., PH.D.Palo Alto, CA 943061992961676
- W. Brown, DDS, FICD, FACDPalo Alto, CA 943041881970457
- Darrell Dang, D.D.S.Palo Alto, CA 943011841322476
- Kurtis Finley, D.D.S.Palo Alto, CA 943011700952546
- Kathryn Jurosky, D.D.S.Palo Alto, CA 943011689732083
- Reza Riahi, DDSPalo Alto, CA 943011952455453
- Mehran Fotovatjah, DDSPalo Alto, CA 943261619094240
Common questions
What is William On, DDS's NPI number?
William On, DDS's National Provider Identifier (NPI) is 1013562586, issued on Aug 1, 2019. An NPI identifies a provider in billing; it is not a license.
Where is William On, DDS located?
The NPPES record lists a practice address at 420 Cambridge Ave Ste 5, Palo Alto, CA, 94306. Phone: (650) 328-3636. Providers update this record themselves, so call before visiting.
How can I verify William On, DDS's license?
NPPES lists California license number 103641, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.