Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Kuo S Ooi, M.D.

Internal Medicine Physician in Rocklin, CA · enumerated 2006.

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

National Provider Identifier

1598775421

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Registry record

Entity type Individual (Type 1)

Name Dr. Kuo S Ooi

Credential M.D.

Sex Male

Practice address Rocklin, CA, 95677

Phone (916) 624-0300

Fax (916) 624-0631

Enumeration date Aug 9, 2006

Last updated in NPPES Mar 7, 2023

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207RS0010X Sports Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License A96680 (CA) Secondary

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License A96680 (CA) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License A96680 (CA) Primary

171100000X Acupuncturist Other Service Providers · License A96680 (CA) Secondary

2080S0010X Pediatric Sports Medicine Physician Allopathic & Osteopathic Physicians · License A96680 (CA) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1598775421 active?

Yes, as of the latest NPPES snapshot, NPI 1598775421 is active (record last updated 2023-03-07).

How do I verify Kuo Ooi's NPI record?

Cross-check NPI 1598775421 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-07.