Physician profile
Derek A Irwin
NPI 1184603300
$403.60
in general payments reported to CMS, 2019-2025
13 companies · $29.17 in 2025
The $29.17 reported for 2025 was less than what a typical Anatomic Pathology & Clinical Pathology provider received nationally (typical 2025 total: $50.59).
Payments by year
General payments by program year, as reported to CMS.
General payments by year: 2019: $65.45 · 2020: $40.42 · 2021: $98.86 · 2022: $170 · 2025: $29.17.
What the payments were for
Nature of payment as categorized by the reporting companies: meals, consulting, travel, and so on.
Food and Beverage: $29.17.
View as a table
| Payment type | Amount (2023-2025) |
|---|---|
| Food and Beverage | $29.17 |
Payment-type detail covers 2023-2025; earlier years are included in totals but not broken out here.
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 | $77.07 | 2020-2022 | |
| Takeda Pharmaceuticals U.S.A., INC. | $66.21 | 2021-2022 | |
| Daiichi Sankyo INC. | $62.25 | 2019-2022 | |
| Amag Pharmaceuticals, INC. | $30.76 | 2021 | |
| Caris Mpi, INC. | $29.17 | 2025 | Mi Cancer Seek |
| Ucb, INC. | $26.62 | 2019 | |
| Ardelyx, INC. | $25.30 | 2022 | |
| Redhill Biopharma INC. | $19.26 | 2022 | |
| Janssen Biotech, INC. | $17.22 | 2019 | |
| Braintree Laboratories, INC. | $14.12 | 2022 | |
| Qol Medical, LLC | $12.69 | 2021 | |
| Merck Sharp & Dohme LLC | $12.14 | 2022 | |
| Endo Pharmaceuticals INC. | $10.79 | 2019 |
Drugs and devices associated with these payments
CMS records which products a payment was associated with, not how the money was allocated. Association is not allocation: one payment can be associated with several products, and a product listing does not mean the payment was made because of that product. Product detail covers 2023-2025.
If you want to bring it up
Most clinicians are glad to talk about this. A respectful way in:
- "I saw Derek Irwin 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.