Chuan M. Nguyen, M.D.
NPI 1144328303ActiveIndividual· Internal Medicine· Anaheim, CA
Internal Medicine (M.D.) in Anaheim, California, trained at University of California, Geffen School of Medicine (class of 1996). Their prescriptions cost Medicare Part D more than their services did: $635,435 for 8,099 claims, against $13,198 paid for services in 2024. Bayer Healthcare Pharmaceuticals Inc. was the largest of 11 companies reporting payments in 2025, $586.82 in all, mostly food and beverage.
Overview
| NPI | 1144328303 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Sep 20, 2006 |
| Last updated in NPPES | Mar 7, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A63490 | 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 | 84 |
|---|---|
| Services billed | 209 across 19 procedure codes |
| Paid by Medicare | $13,198 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,099 · 18,833 30-day fills |
|---|---|
| Patients | 675 |
| Total drug cost | $635,435 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | University of California, Geffen School of Medicine |
|---|---|
| Graduation year | 1996 |
| Medicare specialty | Internal Medicine |
Medical group
- Primary and Multi-Specialty Clinics of AnaheimAnaheim, CA · 7 clinicians
Industry payments (Open Payments)
- 2025$586.82 · 26 payments from 11 companies
- 2024$298.43 · 13 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Bayer Healthcare Pharmaceuticals Inc. | $156.57 | 6 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $125.93 | 5 |
| Amgen Inc. | $105.98 | 5 |
| Merck Sharp & Dohme LLC | $44.73 | 2 |
| Novo Nordisk Inc | $38.04 | 2 |
What the 2025 payments were for
- Food and Beverage$586.82 · 26 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 235 internal medicine physicians in Anaheim · All internal medicine physicians in California