Sigma
Payments companies reported to CMS as associated with Sigma. "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 Sigma, 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 Sigma
These are the largest totals companies reported as associated with Sigma. 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) |
|---|---|---|---|
| Thomas Thornhill | Boston, MA | Orthopaedic Surgery | $5,078,143.33 |
| Wayne Goldstein | Morton Grove, IL | Orthopaedic Surgery | $2,061,022.96 |
| John Callaghan | Iowa City, IA | Orthopaedic Surgery | $628,126.84 |
| Andrew Star | Blue Bell, PA | Orthopaedic Surgery | $88,287.19 |
| Andrew Spitzer | Los Angeles, CA | Orthopaedic Surgery | $75,775.63 |
| Anna Kulidjian | La Jolla, CA | Orthopaedic Surgery | $43,308.78 |
| Robert Gorab | Orange, CA | Orthopaedic Surgery | $19,272.05 |
| Jonathon Salava | Topeka, KS | Adult Reconstructive Orthopaedic Surgery | $14,287.50 |
| George Haidukewych | Orlando, FL | Orthopaedic Surgery | $3,712.50 |
| Cyrus Abbaschian | Plano, TX | Orthopaedic Surgery | $3,600.00 |
Prescribed Sigma?
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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.