Amy C. Chang, MD
NPI 1255490827ActiveIndividual· Internal Medicine, Rheumatology· Riverside, CA
Internal Medicine, Rheumatology (MD) in Riverside, California, trained at University of Southern California Keck School of Medicine (class of 1997). Part D covered 1,973 prescriptions written in 2024, 72% of them generic. Genzyme Corporation was the largest of 5 companies reporting payments in 2025, $496.49 in all, mostly food and beverage.
Overview
| NPI | 1255490827 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Dec 8, 2006 |
| Last updated in NPPES | Dec 2, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Rheumatology Primary | 207RR0500X | A69032 | 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 - Rheumatology (CA) |
|---|
Part D prescriptions in 2024
| Prescriptions (claims) | 1,973 · 4,590 30-day fills |
|---|---|
| Patients | 367 |
| Total drug cost | $1,794,716 |
| Generic share | 72% of claims |
Education and affiliations
| Medical school | University of Southern California Keck School of Medicine |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Rheumatology |
Medical group
- Southern California Permanente Medical GroupRedlands, CA · 11,293 clinicians
Industry payments (Open Payments)
- 2025$496.49 · 5 payments from 5 companies
- 2024$124.99 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genzyme Corporation | $134.47 | 1 |
| Astrazeneca Pharmaceuticals LP | $128.49 | 1 |
| Aurinia Pharma U.S., Inc. | $125.00 | 1 |
| Janssen Biotech, Inc. | $59.99 | 1 |
| Glaxosmithkline, LLC. | $48.54 | 1 |
What the 2025 payments were for
- Food and Beverage$496.49 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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