Thomas J. Chen, M.D.
NPI 1053329227ActiveIndividual· Internal Medicine· Riverside, CA
Internal Medicine (M.D.) in Riverside, California, trained at Loma Linda University School of Medicine (class of 2002). Part D covered 1,920 prescriptions written in 2024, 86% of them generic. Amgen Inc. was the largest of 2 companies reporting payments in 2025, $249.85 in all, mostly food and beverage.
Overview
| NPI | 1053329227 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 4, 2006 |
| Last updated in NPPES | Nov 29, 2021 |
| Certified by provider | Feb 13, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A85898 | CA |
| Pediatrics | 208000000X | A85898 | 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) |
|---|
Part D prescriptions in 2024
| Prescriptions (claims) | 1,920 · 4,660 30-day fills |
|---|---|
| Patients | 196 |
| Total drug cost | $106,712 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | Loma Linda University School of Medicine |
|---|---|
| Graduation year | 2002 |
| Medicare specialty | Internal Medicine |
Medical group
- Southern California Permanente Medical GroupRedlands, CA · 11,293 clinicians
Industry payments (Open Payments)
- 2025$249.85 · 2 payments from 2 companies
- 2024$147.53 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $125.60 | 1 |
| Astrazeneca Pharmaceuticals LP | $124.25 | 1 |
What the 2025 payments were for
- Food and Beverage$249.85 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 246 internal medicine physicians in Riverside · All internal medicine physicians in California