Gattex
Payments companies reported to CMS as associated with Gattex. "Associated with" is CMS's wording: it links a payment to a product without saying the money was spent on it.
By year
Payments reported as associated with Gattex, per program year, as reported to CMS.
Who makes it
Specialties most often involved
Where the associated payments went, by the receiving clinician's specialty.
Clinicians most associated with Gattex
These are the largest totals companies reported as associated with Gattex. They are typically speaking or consulting arrangements, which companies must report by law; appearing here is not evidence of anything improper.
| Clinician | Location | Specialty | Associated payments (2023-2025) |
|---|---|---|---|
| Syed-Mohammed Jafri | Detroit, MI | Transplant Hepatology | $101,695.25 |
| John Monson | Danbury, CT | Colon & Rectal Surgery | $85,362.55 |
| Robert Jacobson | Dallas, TX | Colon & Rectal Surgery | $84,567.59 |
| Sivan Kinberg | New York, NY | Pediatric Gastroenterology | $71,961.51 |
| Valeria Cohran | Chicago, IL | Pediatric Gastroenterology | $68,229.86 |
| Maryam Shambayati | Oklahoma City, OK | Pediatric Gastroenterology | $57,271.16 |
| Dejan Micic | Chicago, IL | Gastroenterology (Internal Medicine) | $49,120.99 |
| Kishore Iyer | New York, NY | Transplant Surgery | $46,489.81 |
| David Mercer | Omaha, NE | Transplant Surgery | $33,035.47 |
| Joel Mason | Boston, MA | Gastroenterology (Internal Medicine) | $25,808.83 |
Prescribed Gattex?
See what its makers reported for your doctor. Two steps, private, no account.
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.