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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

TERESA NGUYEN
NPI 1275381683
Physician Assistant in Fullerton, CA

Active since May 09, 2024PECOS Enrolled
101 E VALENCIA MESA DR, FULLERTON, CA 92835(626) 457-4240 Get Directions Write a Review

NPPES record last updated: July 30, 2026. Verified against the NPPES registry weekly; last sync: September 06, 2026.

Record update history: Jul 30, 2026, May 9, 2024 (2 updates tracked since 2024).

About Teresa Nguyen NPPES

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

TERESA NGUYEN (NPI 1275381683) is an individual physician assistant in Fullerton, California, licensed in California (PA68477) and active in the NPI registry since May 2024. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1275381683
Entity TypeIndividualFemale
Primary Taxonomy363A00000X
Provider Legal NameTERESA NGUYEN
Location Address101 E VALENCIA MESA DRFullerton, CA 92835-3809
Mailing Address7250 Fermo PlRancho Cucamonga, CA 91701-8518
Phone(626) 457-4240
Sole ProprietorNo
Enumeration DateMay 9, 2024
Last NPPES UpdateJuly 30, 20262 updates tracked since enumeration
NPPES CertifiedJuly 30, 2026
✔ NPI 1275381683 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363A00000X
License✔ Licensed in CA · PA68477
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.
101 E VALENCIA MESA DR, Fullerton, CA 92835
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Teresa Nguyen is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92835 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
Established Patient
$77.96 typical visit price
range $20.84 – $153.61
Typical copayment $19.49 (range $5.21 – $38.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

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

PIUS J. KIM M.D.
Internal Medicine
101 E VALENCIA MESA DR
FULLERTON, CA 92835
Orange County (714) 447-5027
PARAM WALIA MD NEUROSCIENCES SERVICES CORPORATION
Neurological Surgery
101 E VALENCIA MESA DR
FULLERTON, CA 92835
Orange County (714) 446-5830
JOHN BYRON MACCARTHY MD
Anesthesiology
101 E VALENCIA MESA DR
FULLERTON, CA 92835
Orange County (714) 871-3280
GLORIA LYNN FRANKLIN NP MSN
Nurse Practitioner (Family)
101 E VALENCIA MESA DR
FULLERTON, CA 92835
Orange County (909) 717-9589
DR. MARTIN JOSEPH BREEN JR. PHARM.D.
Pharmacist (Pharmacotherapy)
101 E VALENCIA MESA DR
FULLERTON, CA 92835
Orange County (714) 992-3143
NELSON IVAN AGUINAGA RN, FNP
Nurse Practitioner (Family)
101 E VALENCIA MESA DR
FULLERTON, CA 92835
Orange County (714) 871-3280
DR. JONATHON AHN MD
Anesthesiology
101 E VALENCIA MESA DR
FULLERTON, CA 92835
Orange County (714) 871-3280
MR. DANIEL BENJAMIN GRAVILONI RCP
Respiratory Therapist, Registered (Neonatal/Pediatrics)
101 E VALENCIA MESA DR
FULLERTON, CA 92835
Orange County (714) 992-3000

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 Teresa Nguyen's NPI number?

The NPI number for Teresa Nguyen is 1275381683. It was assigned to this individual provider in the NPPES registry on May 9, 2024.

Where is Teresa Nguyen located?

Teresa Nguyen practices at 101 E Valencia Mesa Dr, Fullerton, CA 92835. The listed phone number is (626) 457-4240.

What is Teresa Nguyen's specialty?

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

Is Teresa Nguyen enrolled in Medicare?

Yes. Teresa Nguyen is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Teresa Nguyen was last updated on July 30, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 42 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.