Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

On-Tat Lee, M.D.

Ophthalmology Physician in Stockton, CA · enumerated 2012.

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

National Provider Identifier

1194084517

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Registry record

Entity type Individual (Type 1)

Name On-Tat Lee

Credential M.D.

Sex Male

Practice address 1617 Saint Marks Plz Ste D, Stockton, CA, 95207

Phone (209) 478-1797

Fax (209) 478-1224

Enumeration date May 4, 2012

Last updated in NPPES Jul 14, 2023

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License A138659 (CA) Primary

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 1194084517 active?

Yes, as of the latest NPPES snapshot, NPI 1194084517 is active (record last updated 2023-07-14).

How do I verify On-Tat Lee's NPI record?

Cross-check NPI 1194084517 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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Aamun Garcha Optometrist · Stockton, CA NPI 1639832801

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-07-14.