Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Winson Ong Od

Optometrist in Antioch, CA · enumerated 2019 · authorized official Winson Ong, Ceo.

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

National Provider Identifier

1770130932

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Registry record

Entity type Organization (Type 2)

Legal business name Winson Ong Od

Other name <Unavail>

Practice address 5109 Lone Tree Way, Antioch, CA, 94531

Phone (925) 757-5560

Enumeration date Aug 22, 2019

Last updated in NPPES Jul 8, 2020

Taxonomy & classification

152W00000X Optometrist Eye and Vision Services Providers Primary

Authorized official

Name Winson Ong

Title Ceo

Phone (925) 757-5560

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

Where is Winson Ong Od located?

The practice location on file with NPPES is in Antioch, CA.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2020-07-08. Verify at npiregistry.cms.hhs.gov.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-07-08.