Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Lilly Chang, OD

Optometrist in Sonoma, CA · enumerated 2019 · practices at Kevin P & Laura L Martin.

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

National Provider Identifier

1619521259

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Registry record

Entity type Individual (Type 1)

Name Dr. Lilly Chang

Credential OD

Sex Female

Practice address 201 W Napa St Ste 3, Sonoma, CA, 95476

Phone (707) 938-3937

Enumeration date Jul 31, 2019

Last updated in NPPES Oct 27, 2020

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 34315TLG (CA) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD 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 1619521259 active?

Yes, as of the latest NPPES snapshot, NPI 1619521259 is active (record last updated 2020-10-27).

How do I verify Lilly Chang's NPI record?

Cross-check NPI 1619521259 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Kevin P & Laura L Martin Optometrist · Sonoma, CA NPI 1043541857

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-10-27.