GlassScriptPhysician profile
Ilwoong W Chang
NPI 1578524831
$1,922.83
in general payments reported to CMS, 2019-2025
15 companies · none reported in 2025
See the full distribution for Gastroenterology (Internal Medicine)
Payments by year
General payments by program year, as reported to CMS.
General payments by year: 2019: $538 · 2020: $603 · 2021: $698 · 2022: $83.31.
Who reported paying
General payments only, as reported to CMS. Product names cover 2023-2025.
| Company | General payments | Years | Top products |
|---|---|---|---|
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $375.35 | 2019-2022 | |
| Allergan, INC. | $294.20 | 2019-2020 | |
| Nestle Healthcare Nutrition INC. | $244.77 | 2021-2022 | |
| Ambu INC. | $196.87 | 2020 | |
| Takeda Pharmaceuticals U.S.A., INC. | $148.90 | 2020-2021 | |
| Abbvie INC. | $137.20 | 2019-2021 | |
| Braintree Laboratories, INC. | $136.01 | 2019-2022 | |
| Ironwood Pharmaceuticals, INC | $119.75 | 2020-2021 | |
| Janssen Biotech, INC. | $61.76 | 2020-2021 | |
| Gilead Sciences, INC. | $55.49 | 2021 | |
| Romark Laboratories, Lc | $42.78 | 2019-2020 | |
| Merck Sharp & Dohme LLC | $41.54 | 2019-2021 | |
| Intercept Pharmaceuticals, INC. | $29.30 | 2019-2020 | |
| Redhill Biopharma INC. | $23.10 | 2020 | |
| Vivus LLC | $15.81 | 2020 |
If you want to bring it up
Most clinicians are glad to talk about this. A respectful way in:
- "I saw Ilwoong 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.