Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Geronimo & Leong, Professional Optometric Corporation

Optometrist in San Leandro, CA · enumerated 2006 · authorized official Joanna Leong, Ceo.

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

National Provider Identifier

1144394057

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)

Legal business name Geronimo & Leong, Professional Optometric Corporation

Practice address 15251 E 14th St Ste B, San Leandro, CA, 94578

Phone (510) 481-2121

Fax (510) 481-2129

Enumeration date Nov 20, 2006

Last updated in NPPES Oct 8, 2009

Taxonomy & classification

152W00000X Optometrist Eye and Vision Services Providers · License 977 (CA) Primary

Authorized official

Name Joanna Leong

Title Ceo

Phone (510) 481-2121

Other identifiers

Identifier	Type	State	Issuer
ZZZ26906Z	Other	CA	MEDICARE NSC (PTAN)

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

Who is the authorized official for Geronimo & Leong, Professional Optometric Corporation?

NPPES lists Joanna Leong (Ceo) as the authorized official for this organization.

What is the NPI number for Geronimo & Leong, Professional Optometric Corporation?

The NPI for Geronimo & Leong, Professional Optometric Corporation is 1144394057, a Type 2 (organization) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-10-08.