Thomas T. Quach, MD
Obstetrics & Gynecology Physician · Westminster, CA
Thomas T. Quach, MD is an obstetrics & gynecology physician with a practice address in Westminster, California, and NPI 1033123146, issued on Jul 27, 2006. Check the license (California G080556, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas T. Quach
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- G080556 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9186 Bolsa Ave, Westminster, CA 92683
- Phone
- (714) 799-7522
- Enumerated
- Jul 27, 2006
- Record last updated
- Oct 10, 2025
- Fax
- (714) 799-7523
- Medicaid ID
- 00G805560 CA
- Medicare enrollment
- Enrolled (PECOS I20120125000725); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 1993
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 9186 Bolsa Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Thu Nguyen, NPNurse Practitioner1962780106
Verify Thomas T. Quach in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G080556Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
31% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
114 Medicare Part D claims for 56 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Estradiol22 claims
- Fluconazole14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $143.95
6 payments; by number, the most common kind was food and beverage; the largest payer was Astellas Pharma US Inc. The 21,429 providers of this specialty with any payment received $1,030.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Thomas T. Quach among 5,088 obstetrics & gynecology physician records in California
Thomas T. Quach, MD is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1993 · median 2004 among the 2,700 with a school on file
- Record last updated2025 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Westminster → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Marli Amin, M.D.Westminster, CA 926831629257530
- Christine Hoang, MDWestminster, CA 926831770537144
- Ngoc My Huynh, MDWestminster, CA 926831043377039
- Co Pham, MDWestminster, CA 926831558392159
- Dzu Tran, MDWestminster, CA 926831821025032
- Hau Vuong, MDWestminster, CA 926831619057619
- Marsha Granese, M.D.Rancho Santa Margarita, CA 926881063572915
- Anne Van De Water, M.D.Laguna Niguel, CA 926771720320666
Common questions
What is Thomas T. Quach, MD's NPI number?
Thomas T. Quach, MD's National Provider Identifier (NPI) is 1033123146, issued on Jul 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas T. Quach, MD located?
The NPPES record lists a practice address at 9186 Bolsa Ave, Westminster, CA, 92683. Phone: (714) 799-7522. Providers update this record themselves, so call before visiting.
How can I verify Thomas T. Quach, MD's license?
NPPES lists California license number G080556, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thomas T. Quach, MD prescribe under Medicare Part D?
In 2024, Thomas T. Quach, MD had 114 Medicare Part D claims for 56 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.