Cor-Knot
Payments companies reported to CMS as associated with Cor-Knot. "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 Cor-Knot, 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 Cor-Knot
These are the largest totals companies reported as associated with Cor-Knot. 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) |
|---|---|---|---|
| Michael Defrain | Pensacola, FL | Thoracic Surgery (Cardiothoracic Vascular Surgery) | $101,205.29 |
| Mahesh Ramchandani | Houston, TX | Thoracic Surgery (Cardiothoracic Vascular Surgery) | $30,375.91 |
| Andrea Berecz-Prewitt | Port Charlotte, FL | Surgical | $24,036.01 |
| Tyler Reed | Port Charlotte, FL | Physician Assistant | $23,086.41 |
| Mario Castillo-Sang | Edgewood, KY | Thoracic Surgery (Cardiothoracic Vascular Surgery) | $20,275.44 |
| Juan Penaranda-Canal | Edgewood, KY | Thoracic Surgery (Cardiothoracic Vascular Surgery) | $14,106.41 |
| Gianluca Torregrossa | Chicago, IL | Thoracic Surgery (Cardiothoracic Vascular Surgery) | $12,460.88 |
| Amanda Yakobitis | Wynnewood, PA | Surgical | $10,980.14 |
| Paul Digiorgi | Port Charlotte, FL | Thoracic Surgery (Cardiothoracic Vascular Surgery) | $9,203.00 |
| Ziyab Sarfaraz | Houston, TX | Thoracic Surgery (Cardiothoracic Vascular Surgery) | $6,802.89 |
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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.