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DR. THERESA TOQUYEN NGUYEN DO
NPI 1679884928
Psychiatry & Neurology - Child & Adolescent Psychiatry in Tustin, CA

Active since July 01, 2010PECOS EnrolledAccepts Medicare Assignment
15405 LANSDOWNE RD, TUSTIN, CA 92782(925) 997-9093 Get Directions Write a Review

NPPES record last updated: June 28, 2023. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Feb 2, 2022, Aug 6, 2020 (2 updates tracked since 2020).

About Dr. Theresa Toquyen Nguyen Do NPPES

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

DR. THERESA TOQUYEN NGUYEN DO (NPI 1679884928) is an individual child & adolescent psychiatry provider in Tustin, California, licensed in California (20A12682) and active in the NPI registry since July 2010. She is enrolled in Medicare PECOS, maintains a secondary practice location in Yuma, and is a graduate of Other (2010).

NPPES Registry Identity

NPI1679884928
Entity TypeIndividualFemale
Primary Taxonomy2084P0804X
Provider Legal NameDR. THERESA TOQUYEN NGUYENCredential: DO
Location Address15405 LANSDOWNE RDTustin, CA 92782
Mailing AddressOne Hospital Drive, Dc018.00Columbia, MO 65202
Phone(925) 997-9093
Sole ProprietorNo
Medical School CMSOtherGraduated 2010
Enumeration DateJuly 1, 2010
Last NPPES UpdateJune 28, 20232 updates tracked since enumeration
NPPES CertifiedJune 28, 2023
✔ NPI 1679884928 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychiatry & Neurology · Child & Adolescent PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0804X
Licenses✔ Licensed in CA · 20A12682✔ Licensed in AZ · 007228
Definition
Child & Adolescent Psychiatry is a subspecialty of psychiatry with additional skills and training in the diagnosis and treatment of developmental, behavioral, emotional, and mental disorders of childhood and adolescence.
Also ListedPsychiatry & Neurology · PsychiatryTaxonomy 2084P0800X · License 20A12682 (CA)
15405 LANSDOWNE RD, Tustin, CA 92782
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Secondary Practice Location 1

Location 12851 S Avenue B Ste 2901Yuma, AZ 85364-7756 · Phone (928) 376-0026

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross Blue Shield of Arizona.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Theresa Toquyen Nguyen Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID648603233
PECOS Enrollment IDI20191212002388
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.

Other Providers at the Same Location NPPES 9

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

SHAWN SINCLAIR LCSW
Social Worker (Clinical)
15405 LANSDOWNE RD
TUSTIN, CA 92782
Orange County (714) 258-7710
HEALTHRIGHT 360
Clinic/Center (Recovery Care)
15405 LANSDOWNE RD
TUSTIN, CA 92782
Orange County (714) 732-2326
HEALTHRIGHT 360
Community/Behavioral Health
15405 LANSDOWNE RD
TUSTIN, CA 92782
Orange County (714) 566-2804
CHARLENE NGUON-RODRIGUEZ AMFT, APCC
Marriage & Family Therapist
15405 LANSDOWNE RD
TUSTIN, CA 92782
Orange County (714) 258-7710
IMELDA SINTORA LMFT
Marriage & Family Therapist
15405 LANSDOWNE RD
TUSTIN, CA 92782
Orange County (714) 949-0228
MARK DOUGLAS POMPEO
Counselor
15405 LANSDOWNE RD
TUSTIN, CA 92782
Orange County (714) 258-7710
ELIZABETH MARIE SALAS
Counselor (Addiction (Substance Use Disorder))
15405 LANSDOWNE RD
TUSTIN, CA 92782
Orange County (562) 343-3376
JANET LOPEZ
Counselor (Addiction (Substance Use Disorder))
15405 LANSDOWNE RD
TUSTIN, CA 92782
Orange County (714) 566-8436

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 Theresa Nguyen's NPI number?

The NPI number for Theresa Nguyen is 1679884928. It was assigned to this individual provider in the NPPES registry on July 1, 2010.

Where is Theresa Nguyen located?

Theresa Nguyen practices at 15405 Lansdowne Rd, Tustin, CA 92782. The listed phone number is (925) 997-9093.

What is Theresa Nguyen's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Child & Adolescent Psychiatry, with taxonomy code 2084P0804X.

Is Theresa Nguyen enrolled in Medicare?

Yes. Theresa Nguyen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Theresa Nguyen accept?

Health plans from Blue Cross Blue Shield of Arizona list Theresa Nguyen as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Theresa Nguyen was last updated on June 28, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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.