Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Diane H Williams, OD

Optometrist in Danville, CA · enumerated 2006.

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

National Provider Identifier

1790746238

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Registry record

Entity type Individual (Type 1)

Name Diane H Williams

Credential OD

Sex Female

Practice address 909 San Ramon Valley Blvd, Suite 114, Danville, CA, 94526

Phone (925) 837-5922

Fax (925) 837-1403

Enumeration date Mar 31, 2006

Last updated in NPPES Dec 18, 2008

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 7087 (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.

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Frequently asked questions

How do I verify Diane Williams's NPI record?

Cross-check NPI 1790746238 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1790746238 active?

Yes, as of the latest NPPES snapshot, NPI 1790746238 is active (record last updated 2008-12-18).

Other providers at this practice address

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Claudia Pinilla Ophthalmology Physician · Danville, CA NPI 1598751638 Rupinder Mann Ophthalmology Physician · Danville, CA NPI 1770579443 Danville-San Ramon Eye Medical Corp Ophthalmology Physician · Danville, CA NPI 1437146206 F. Ryan Anderson, MD Obstetrics & Gynecology Physician · Danville, CA NPI 1598793663 Lawrence Teplin Podiatrist · Danville, CA NPI 1134139777 Roger Greenwald Ophthalmology Physician · Danville, CA NPI 1124223482 Lawrence A Teplin Dpm Podiatrist · Danville, CA NPI 1174824544

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-12-18.