Tom S. Chang, MD
NPI 1609848969ActiveIndividual· Ophthalmology, Retina Specialist· Pasadena, CA
Ophthalmology, Retina Specialist (MD) with Retina Institute of California Medical Group, A California Medical Par, practicing in Pasadena, California. In 2024 Medicare paid $1,948,943 for 701 patients, and Part D covered 1,080 of their prescriptions, 58% of them generic. Gilead Sciences, Inc. reported $147.88 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1609848969 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Feb 2, 2006 |
| Last updated in NPPES | Aug 7, 2020 |
| Certified by provider | Aug 7, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology, Retina Specialist Primary | 207WX0107X | A69909 | CA |
| Ophthalmology | 207W00000X | A69909 | 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 - Ophthalmology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 701 |
|---|---|
| Services billed | 15,128 across 39 procedure codes |
| Paid by Medicare | $1,948,943 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,080 · 1,735 30-day fills |
|---|---|
| Patients | 385 |
| Total drug cost | $74,050 |
| Generic share | 58% of claims |
Education and affiliations
| Graduation year | 1988 |
|---|---|
| Medicare specialty | Ophthalmology |
Medical group
- Retina Institute of California Medical Group, A California Medical ParPalm Desert, CA · 77 clinicians
Industry payments (Open Payments)
- 2025$147.88 · 1 payment from 1 company
- 2024$258.39 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $147.88 | 1 |
What the 2025 payments were for
- Food and Beverage$147.88 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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