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Jonathan Pui-Kay Siu, D.O.

Family Medicine Physician in Claremont, CA · enumerated 2014 · practices at Kaiser Foundation Health Plan Inc.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1346652179

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Registry record

Entity type Individual (Type 1)
Name Jonathan Pui-Kay Siu
Credential D.O.
Sex Male
Practice address 250 W San Jose Ave, Claremont, CA, 91711
Phone (888) 750-0036
Enumeration date May 28, 2014
Last updated in NPPES Dec 6, 2021

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary
207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 20A14265 (CA) Primary
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is Jonathan Siu?
Jonathan Siu is registered in NPPES with the primary taxonomy of Family Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-06.