Anhtuan Duy Nguyen, MD
NPI 1386698660ActiveIndividual· Internal Medicine· Westminster, CA
Internal Medicine (MD) in Westminster, California, trained at University of Alabama School of Medicine (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $2,836,794 for 26,746 claims, against $129,539 paid for services in 2024. Gilead Sciences, Inc. was the largest of 8 companies reporting payments in 2025, $707.67 in all, mostly food and beverage.
Overview
| NPI | 1386698660 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 20, 2006 |
| Last updated in NPPES | Nov 17, 2020 |
| Certified by provider | Nov 17, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A62375 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 230 |
|---|---|
| Services billed | 2,485 across 17 procedure codes |
| Paid by Medicare | $129,539 |
Part D prescriptions in 2024
| Prescriptions (claims) | 26,746 · 51,360 30-day fills |
|---|---|
| Patients | 805 |
| Total drug cost | $2,836,794 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | University of Alabama School of Medicine |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Industry payments (Open Payments)
- 2025$707.67 · 10 payments from 8 companies
- 2024$1,234 · 14 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $150.00 | 1 |
| Bayer Healthcare Pharmaceuticals Inc. | $144.10 | 1 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $125.00 | 1 |
| Sumitomo Pharma America, Inc. | $89.54 | 1 |
| Amgen Inc. | $79.31 | 2 |
What the 2025 payments were for
- Food and Beverage$707.67 · 10 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 74 internal medicine physicians in Westminster · All internal medicine physicians in California