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DR. THOMAS T QUACH MD
NPI 1033123146
Obstetrics & Gynecology in Westminster, CA

Active since July 27, 2006PECOS EnrolledAccepts Medicare AssignmentCLIA 05D0965664 · Waiver
9186 BOLSA AVE, WESTMINSTER, CA 92683(714) 799-7522(714) 799-7523 Get Directions Write a Review

NPPES record last updated: October 10, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Dr. Thomas T Quach Md NPPES

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

DR. THOMAS T QUACH MD (NPI 1033123146) is an individual obstetrics & gynecology provider in Westminster, California, licensed in California (G080556) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, holds a CLIA Waiver certificate valid through September 26, 2027, and is a graduate of Loma Linda University School Of Medicine (1993).

NPPES Registry Identity

NPI1033123146
Entity TypeIndividualMale
Primary Taxonomy207V00000X
Provider Legal NameDR. THOMAS T QUACHCredential: MD
Location Address9186 BOLSA AVEWestminster, CA 92683-5556
Mailing Address9186 Bolsa AveWestminster, CA 92683-5556 · (714) 799-7522 · Fax (714) 799-7523
Phone(714) 799-7522
Fax(714) 799-7523
Sole ProprietorYes
Medical School CMSLoma Linda University School Of MedicineGraduated 1993
Enumeration DateJuly 27, 2006
Last NPPES UpdateOctober 10, 2025
NPPES CertifiedOctober 10, 2025
✔ NPI 1033123146 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in CA · G080556
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
9186 BOLSA AVE, Westminster, CA 92683
Open in Google Maps ↗

Other Identifiers 1

Medicaid00G805560CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Thomas T Quach Md 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 ID8325215775
PECOS Enrollment IDI20120125000725
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.

Medicare Billing Reassignments

2

Medicare enrollment records show Thomas Quach reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Thomas Tri Quach, MD, Inc
Same address
Obstetrics & Gynecology
9186 BOLSA AVENUE
Westminster, CA 92648
  • Reassigned Medicare billing, California enrollment
NPI 1750652137 (714) 799-7522
Memorialcare Medical Foundation
2.4 mi
Clinic/Center
17360 BROOKHURST ST
Fountain Valley, CA 92708
  • Reassigned Medicare billing, California enrollment
  • 948 clinicians in this Medicare group
NPI 1205167350 (877) 696-3622

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 05D0965664

Thomas Tri Quach MD · Westminster, CA
Active · expires Sep 26, 2027
CLIA Number05D0965664
Laboratory TypePhysician Office
Certificate Effective DateSeptember 27, 2025
Certificate Expiration DateSeptember 26, 2027
Laboratory DirectorThomas T. Quach MD
Laboratory Phone(714) 799-7522
Laboratory LocationThomas Tri Quach MD9186 Bolsa Avenue, Westminster, CA 92683
CLIA data matches this NPI record on: Address Phone
This certificate is issued to a laboratory to perform only waived tests.

Areas of Expertise CMS Part B claims 3

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
209 services105 patients
Cervical or vaginal cancer screening; pelvic and clinical breast examination G0101
This procedure involves checking for health issues in the lower abdomen and chest area. It helps identify early signs of certain conditions, increasing the chance for successful treatment. It's a routine check-up that's important for maintaining good health.
59 services59 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
32 services32 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92683 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
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
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

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

THU GIA NGUYEN NP
Nurse Practitioner
9186 BOLSA AVE
WESTMINSTER, CA 92683
Orange County (714) 711-7522

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 Thomas Quach's NPI number?

The NPI number for Thomas Quach is 1033123146. It was assigned to this individual provider in the NPPES registry on July 27, 2006.

Where is Thomas Quach located?

Thomas Quach practices at 9186 Bolsa Ave, Westminster, CA 92683. The listed phone number is (714) 799-7522.

What is Thomas Quach's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Thomas Quach enrolled in Medicare?

Yes. Thomas Quach 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.

Which organizations bill Medicare for Thomas Quach's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Quach reassigns Medicare benefits to 2 organizations: Thomas Tri Quach, MD, Inc (Westminster, CA) and Memorialcare Medical Foundation (Fountain Valley, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Thomas Quach's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Does Thomas Quach hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 05D0965664) is associated with this NPI, valid through September 26, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Thomas Quach was last updated on October 10, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.