Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Matt Siu, O.D.

Optometrist in Novato, CA · enumerated 2016.

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

National Provider Identifier

1255783106

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Registry record

Entity type Individual (Type 1)

Name Matt Siu

Credential O.D.

Sex Male

Practice address 7075 Redwood Blvd, Ste F, Novato, CA, 94945

Phone (415) 897-2997

Enumeration date Jul 4, 2016

Last updated in NPPES May 30, 2023

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License TA2544 (MD) Secondary

152W00000X Optometrist Eye and Vision Services Providers · License 34420TLG (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

How do I verify Matt Siu's NPI record?

Cross-check NPI 1255783106 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1255783106 active?

Yes, as of the latest NPPES snapshot, NPI 1255783106 is active (record last updated 2023-05-30).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-05-30.