Duc Nguyen, MD
NPI 1306945365ActiveIndividual· Internal Medicine· Santa Ana, CA
Internal Medicine (MD) in Santa Ana, California, trained at University of California, Irvine, California College of Medicine (class of 1989). Their prescriptions cost Medicare Part D more than their services did: $2,336,157 for 10,580 claims, against $731,252 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 18 companies reporting payments in 2025, $2,937 in all, mostly food and beverage.
Overview
| NPI | 1306945365 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Sep 22, 2006 |
| Last updated in NPPES | Sep 21, 2026 |
| Certified by provider | Sep 21, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A53620 | 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 | 818 |
|---|---|
| Services billed | 14,708 across 48 procedure codes |
| Paid by Medicare | $731,252 |
Part D prescriptions in 2024
| Prescriptions (claims) | 10,580 · 20,250 30-day fills |
|---|---|
| Patients | 821 |
| Total drug cost | $2,336,157 |
| Generic share | 82% of claims |
Education and affiliations
| Medical school | University of California, Irvine, California College of Medicine |
|---|---|
| Graduation year | 1989 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Critical Care (Intensivists), Pulmonary Disease |
| Telehealth | Offers telehealth |
Hospital affiliations
- Adventist Health Simi ValleySimi Valley, CA
- Community Memorial Hospital - VenturaVentura, CA
- Los Robles Hospital & Medical CenterThousand Oaks, CA
- Marian Regional Medical CenterSanta Maria, CA
- Saint Francis Medical CenterCape Girardeau, MO
Other facilities
- Access Tlc Home Health CareHome health agency · San Fernando, CA
- Assisted Home CareHome health agency · Mission Hills, CA
- Central Coast Home Health IncHome health agency · San Luis Obispo, CA
- Hand in Heart Home Health IncHome health agency · Ventura, CA
- Professional Care Home Health Services IncHome health agency · Simi Valley, CA
- Camarillo Healthcare CenterNursing home · Camarillo, CA
Industry payments (Open Payments)
- 2025$2,937 · 134 payments from 18 companies
- 2024$4,767 · 105 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $515.05 | 34 |
| Amgen Inc. | $434.16 | 23 |
| Glaxosmithkline, LLC. | $419.38 | 21 |
| Actelion Pharmaceuticals US, Inc. | $407.92 | 10 |
| Abbvie Inc. | $270.69 | 9 |
What the 2025 payments were for
- Food and Beverage$2,903 · 133 payments
- Education$34.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 72 internal medicine physicians in Santa Ana · All internal medicine physicians in California