Thomas T. Quach, MD
NPI 1033123146ActiveIndividual· Obstetrics & Gynecology· Westminster, CA
Obstetrics & Gynecology (MD) in Westminster, California, trained at Loma Linda University School of Medicine (class of 1993). In 2024 Medicare paid $23,556 for 164 patients, and Part D covered 114 of their prescriptions, 79% of them generic. Sumitomo Pharma America, Inc. was the largest of 4 companies reporting payments in 2025, $363.52 in all, mostly food and beverage.
Overview
| NPI | 1033123146 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jul 27, 2006 |
| Last updated in NPPES | Oct 10, 2025 |
| Certified by provider | Oct 10, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Obstetrics & Gynecology Primary | 207V00000X | G080556 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Obstetrics/Gynecology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 164 |
|---|---|
| Services billed | 339 across 13 procedure codes |
| Paid by Medicare | $23,556 |
Part D prescriptions in 2024
| Prescriptions (claims) | 114 · 166 30-day fills |
|---|---|
| Patients | 56 |
| Total drug cost | $9,409 |
| Generic share | 79% of claims |
Education and affiliations
| Medical school | Loma Linda University School of Medicine |
|---|---|
| Graduation year | 1993 |
| Medicare specialty | Obstetrics/Gynecology |
Hospital affiliations
- Memorialcare Orange Coast Medical CenterFountain Valley, CA
- Uci Health-OrangeOrange, CA
Industry payments (Open Payments)
- 2025$363.52 · 4 payments from 4 companies
- 2024$143.95 · 6 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sumitomo Pharma America, Inc. | $140.85 | 1 |
| Phathom Pharmaceuticals, Inc. | $124.26 | 1 |
| Astellas Pharma US Inc | $68.99 | 1 |
| Dexcom, Inc. | $29.42 | 1 |
What the 2025 payments were for
- Food and Beverage$294.53 · 3 payments
- Education$68.99 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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