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

Gregory L Tom, O.D.

Corneal and Contact Management Optometrist in San Ramon, CA · enumerated 2007.

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

National Provider Identifier

1124245568

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Registry record

Entity type Individual (Type 1)

Name Gregory L Tom

Credential O.D.

Sex Male

Practice address San Ramon, CA, 94582

Phone (510) 206-8152

Enumeration date Apr 19, 2007

Last updated in NPPES Aug 24, 2009

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

Taxonomy & licenses

152WC0802X Corneal and Contact Management Optometrist Eye and Vision Services Providers · License 10427T (CA) Primary

152WL0500X Low Vision Rehabilitation Optometrist Eye and Vision Services Providers · License 10427T (CA) Secondary

152WV0400X Vision Therapy Optometrist Eye and Vision Services Providers · License 10427T (CA) Secondary

152WP0200X Pediatric Optometrist Eye and Vision Services Providers · License 10427T (CA) Secondary

152WS0006X Sports Vision Optometrist Eye and Vision Services Providers · License 10427T (CA) Secondary

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 Gregory Tom's NPI record?

Cross-check NPI 1124245568 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1124245568 active?

Yes, as of the latest NPPES snapshot, NPI 1124245568 is active (record last updated 2009-08-24).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-08-24.