Physician profile
Alan Ym Chang
NPI 1972576742
$411.78
in general payments reported to CMS, 2019-2025
10 companies · none reported in 2025
Payments by year
General payments by program year, as reported to CMS.
General payments by year: 2019: $339 · 2020: $73.19.
Who reported paying
General payments only, as reported to CMS. Product names cover 2023-2025.
| Company | General payments | Years | Top products |
|---|---|---|---|
| Tris Pharma INC | $105.81 | 2019-2020 | |
| Pfizer INC. | $69.98 | 2019-2020 | |
| Takeda Pharmaceuticals U.S.A., INC. | $55.09 | 2019-2020 | |
| Neos Therapeutics, LP | $52.01 | 2019-2020 | |
| Sanofi Pasteur INC. | $30.72 | 2019 | |
| Ironshore Pharmaceuticals INC. | $25.63 | 2019 | |
| Merck Sharp & Dohme LLC | $23.59 | 2019 | |
| Glaxosmithkline, LLC. | $19.00 | 2019 | |
| Cranial Technologies, INC | $18.14 | 2019 | |
| Shire North American Group INC | $11.81 | 2019 |
If you want to bring it up
Most clinicians are glad to talk about this. A respectful way in:
- "I saw Alan Chang listed in the CMS Open Payments database. Can you tell me about your work with those companies?"
- "Is there a generic or alternative to this medication, and would it work as well for me?"
- "What made you choose this particular treatment for my situation?"
These are normal questions. A good clinician will welcome them.
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Source: CMS Open Payments, program years 2019-2025, as reported to CMS by drug and device makers (published June 30, 2026). Drug and device detail covers 2023-2025.