WILLIAM ON DDS
NPI 1013562586
Dentist - Endodontics in Palo Alto, CA

Q: What is William On's NPI number?

The NPI number for William On is 1013562586. It was assigned to this individual provider in the NPPES registry on August 1, 2019.

Q: What is William On's specialty?

The primary specialty registered for this NPI is Dentist, specializing in Endodontics, with taxonomy code 1223E0200X.

Q: When was this NPI record last updated?

The NPPES record for William On was last updated on February 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since August 01, 2019

420 CAMBRIDGE AVE STE 5, PALO ALTO, CA 94306(650) 328-3636 Get Directions Write a Review

NPPES record last updated: February 18, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Sep 16, 2025, Aug 1, 2019 (2 updates tracked since 2019).

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About William On Dds NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM ON DDS (NPI 1013562586) is an individual endodontics provider in Palo Alto, California, licensed in California (103641) and active in the NPI registry since August 2019.

NPPES Registry Identity

NPI1013562586

Entity TypeIndividualMale

Primary Taxonomy1223E0200X

Provider Legal NameWILLIAM ONCredential: DDS

Location Address420 CAMBRIDGE AVE STE 5Palo Alto, CA 94306-1594

Mailing Address420 Cambridge Ave Ste 5Palo Alto, CA 94306-1594 · (408) 328-3636

Phone(650) 328-3636

Sole ProprietorNo

Enumeration DateAugust 1, 2019

Last NPPES UpdateFebruary 18, 20262 updates tracked since enumeration

NPPES CertifiedFebruary 18, 2026

✔ NPI 1013562586 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · EndodonticsDental Providers

Taxonomy Code1223E0200X

License✔ Licensed in CA · 103641

Definition

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.

420 CAMBRIDGE AVE STE 5, Palo Alto, CA 94306

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Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ANNA BOWERS DDS

Dentist (Endodontics)

420 CAMBRIDGE AVE STE 5
PALO ALTO, CA 94306

Santa Clara County (650) 328-3636

BOWERS AND ON ENDODONTIC PARTNERSHIP

Dentist (Endodontics)

420 CAMBRIDGE AVE STE 5
PALO ALTO, CA 94306

Santa Clara County (650) 328-3636

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William On's NPI number?

The NPI number for William On is 1013562586. It was assigned to this individual provider in the NPPES registry on August 1, 2019.

Where is William On located?

William On practices at 420 Cambridge Ave Ste 5, Palo Alto, CA 94306. The listed phone number is (650) 328-3636.

What is William On's specialty?

The primary specialty registered for this NPI is Dentist, specializing in Endodontics, with taxonomy code 1223E0200X.

When was this NPI record last updated?

The NPPES record for William On was last updated on February 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.