Highest-Volume Colonoscopy with Biopsy Surgeons in Illinois (2026 update)
651 Illinois providers billed Medicare for Colonoscopy with Biopsy (CPT 45380) in 2024. The top 10 by case volume are below — the full ranked list, CSV export and competitor-payment intel are available with a DocVol subscription ($199/mo, cancel anytime).
Database refreshed July 2026Live NPPES registryⓘ sources
| # | Surgeon | Location | Medicare cases (2024) |
|---|---|---|---|
| 1 | Zahoor Makhdoom, MD | Carbondale, IL | 510 |
| 2 | Joel Retsky, MD | Highland Park, IL | 476 |
| 3 | George Atia, M.D. | Barrington, IL | 385 |
| 4 | Vasantha Pai, M.D | Belleville, IL | 356 |
| 5 | Heliodoro Medina, MD | Geneva, IL | 299 |
| 6 | Sharif Zubair, MD | Geneva, IL | 285 |
| 7 | Alexis Ayonote, M.D. | Mattoon, IL | 276 |
| 8 | Jeff Victor, D.O. | St Charles, IL | 275 |
| 9 | Michael Hersh, MD | Buffalo Grove, IL | 261 |
| 10 | Yolandra Johnson, MD | Kenilworth, IL | 259 |
641 more Illinois surgeons in the full list
Plus: who already pays them (Stryker? Medtronic? Arthrex?), CSV export for your CRM, and every other state and procedure.
Search the full databaseFrequently asked questions
- How many surgeons perform Colonoscopy with Biopsy in Illinois?
- 651 Illinois providers billed Medicare for Colonoscopy with Biopsy (CPT 45380) in CY2024. CMS suppresses providers with 10 or fewer Medicare patients, so the true count is somewhat higher.
- Where does this data come from?
- CMS Medicare Physician & Other Practitioners (fee-for-service Part B claims, CY2024, released May 2026) and CMS Open Payments. Both are official U.S. federal datasets.
- Does this include all of a surgeon's cases?
- No — it covers traditional Medicare only (no Medicare Advantage, commercial, or Medicaid claims). Absolute volumes undercount total practice, but the ranking of high- vs low-volume surgeons is a strong targeting signal.