NPI Portal NPI Lookup & Verification

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

Dr. Diem Ngoc Tran, O.D.

Optometrist in Brea, CA · enumerated 2005.

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

National Provider Identifier

1629065792

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Registry record

Entity type Individual (Type 1)
Name Dr. Diem Ngoc Tran
Credential O.D.
Sex Female
Practice address Brea, CA, 92821
Phone (714) 460-3489
Fax (714) 257-1662
Enumeration date Oct 4, 2005
Last updated in NPPES Sep 19, 2018

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

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 12660T (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

What is the NPI number for Diem Tran?
The National Provider Identifier (NPI) for Diem Tran is 1629065792, a Type 1 (individual) record in the CMS NPPES registry.
Where does Diem Tran practice?
The practice location on file with NPPES is in Brea, CA. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-09-19.