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TAMMY M CHEN
NPI 1285347377
Physician Assistant in Diamond Bar, CA

Active since January 04, 2023
888 BREA CANYON RD, DIAMOND BAR, CA 91789(909) 594-3382(626) 667-7633 Get Directions Write a Review

NPPES record last updated: April 15, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Apr 15, 2026, Apr 6, 2026, Jan 4, 2023 (3 updates tracked since 2023).

About Tammy M Chen NPPES

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

TAMMY M CHEN (NPI 1285347377) is an individual physician assistant in Diamond Bar, California and active in the NPI registry since January 2023.

NPPES Registry Identity

NPI1285347377
Entity TypeIndividualFemale
Primary Taxonomy363A00000X
Provider Legal NameTAMMY M CHEN
Location Address888 BREA CANYON RDDiamond Bar, CA 91789-3059
Mailing Address3535 Philadelphia StChino, CA 91710-2089 · (909) 851-0876
Phone(909) 594-3382
Fax(626) 667-7633
Sole ProprietorYes
Enumeration DateJanuary 4, 2023
Last NPPES UpdateApril 15, 20263 updates tracked since enumeration
NPPES CertifiedApril 15, 2026
✔ NPI 1285347377 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363A00000X
Definition
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Also ListedDietitian, RegisteredTaxonomy 133V00000X
888 BREA CANYON RD, Diamond Bar, CA 91789
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Other Providers at the Same Location NPPES

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

JOSEPH W. LEE, A PROFESSIONAL DENTAL CORPORATION
Dentist
888 BREA CANYON RD, STE 210
DIAMOND BAR, CA 91789
Los Angeles County (909) 869-8500

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 Tammy Chen's NPI number?

The NPI number for Tammy Chen is 1285347377. It was assigned to this individual provider in the NPPES registry on January 4, 2023.

Where is Tammy Chen located?

Tammy Chen practices at 888 Brea Canyon Rd, Diamond Bar, CA 91789. The listed phone number is (909) 594-3382.

What is Tammy Chen's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

When was this NPI record last updated?

The NPPES record for Tammy Chen was last updated on April 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.