Tinyee Tsai Chang, MD
NPI 1386861409ActiveIndividual· Dermatology· Redding, CA
Dermatology (MD) in Redding, California, trained at Tufts University School of Medicine (class of 2002). Their prescriptions cost Medicare Part D more than their services did: $2,888,406 for 2,944 claims, against $1,874,223 paid for services in 2024. Abbvie Inc. was the largest of 17 companies reporting payments in 2025, $2,439 in all, mostly food and beverage.
Overview
| NPI | 1386861409 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Apr 19, 2007 |
| Last updated in NPPES | May 30, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology Primary | 207N00000X | A88191 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Dermatology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 2,491 |
|---|---|
| Services billed | 23,615 across 80 procedure codes |
| Paid by Medicare | $1,874,223 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,944 · 3,504 30-day fills |
|---|---|
| Patients | 1,028 |
| Total drug cost | $2,888,406 |
| Generic share | 81% of claims |
Education and affiliations
| Medical school | Tufts University School of Medicine |
|---|---|
| Graduation year | 2002 |
| Medicare specialty | Dermatology |
Hospital affiliation
- Oroville HospitalOroville, CA
Industry payments (Open Payments)
- 2025$2,439 · 137 payments from 17 companies
- 2024$2,855 · 162 payments from 19 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $570.68 | 39 |
| Genzyme Corporation | $498.60 | 18 |
| Janssen Biotech, Inc. | $353.02 | 27 |
| Lilly USA, LLC | $296.30 | 15 |
| Regeneron Healthcare Solutions, Inc. | $141.46 | 12 |
What the 2025 payments were for
- Food and Beverage$2,246 · 134 payments
- Education$192.25 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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