Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ann T Duong, OD

Optometrist in Los Angeles, CA · enumerated 2006.

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

National Provider Identifier

1750397691

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Registry record

Entity type Individual (Type 1)

Name Ann T Duong

Credential OD

Sex Female

Practice address 4403 S Vermont Ave, Los Angeles, CA, 90037

Phone (323) 232-1234

Fax (323) 232-3789

Enumeration date Jul 31, 2006

Last updated in NPPES Dec 3, 2021

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License OPT11578 TPA (CA) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

Other identifiers

Identifier	Type	State	Issuer
SD0115780	Medicaid	CA	-

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

Is NPI 1750397691 active?

Yes, as of the latest NPPES snapshot, NPI 1750397691 is active (record last updated 2021-12-03).

How do I verify Ann Duong's NPI record?

Cross-check NPI 1750397691 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-03.