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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

DENNIS H DUNCAN O.D.
NPI 1962499251
Optometrist in Covina, CA

Active since October 01, 2005
364 E ROWLAND ST, COVINA, CA 91723(626) 331-6448(626) 967-7006 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dennis H Duncan O.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DENNIS H DUNCAN O.D. (NPI 1962499251) is an individual optometrist in Covina, California, licensed in California (6902T) and active in the NPI registry since October 2005.

NPPES Registry Identity

NPI1962499251
Entity TypeIndividualMale
Primary Taxonomy152W00000X
Provider Legal NameDENNIS H DUNCANCredential: O.D.
Location Address364 E ROWLAND STCovina, CA 91723-3154
Mailing Address364 E Rowland StCovina, CA 91723-3154 · (626) 331-6448 · Fax (626) 967-7006
Phone(626) 331-6448
Fax(626) 967-7006
Sole ProprietorNo
Enumeration DateOctober 1, 2005
Last NPPES UpdateJuly 13, 2026
✔ NPI 1962499251 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOptometristEye and Vision Services Providers
Taxonomy Code152W00000X
License✔ Licensed in CA · 6902T
Definition
Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.
364 E ROWLAND ST, Covina, CA 91723
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Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

PERRY S HOM O.D.
Optometrist
364 E ROWLAND ST
COVINA, CA 91723
Los Angeles County (626) 331-6448
CARMEN REZA GUTIERREZ O.D.
Optometrist
364 E ROWLAND ST
COVINA, CA 91723
Los Angeles County (626) 331-6448
FRANCINE MATSUKO HORIBE O.D.
Optometrist
364 E ROWLAND ST
COVINA, CA 91723
Los Angeles County (626) 331-6448

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Dennis Duncan's NPI number?

The NPI number for Dennis Duncan is 1962499251. It was assigned to this individual provider in the NPPES registry on October 1, 2005.

Where is Dennis Duncan located?

Dennis Duncan practices at 364 E Rowland St, Covina, CA 91723. The listed phone number is (626) 331-6448.

What is Dennis Duncan's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

When was this NPI record last updated?

The NPPES record for Dennis Duncan was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.