Highest-Volume Total Shoulder Replacement Surgeons in Illinois (2026 update)
85 Illinois providers billed Medicare for Total Shoulder Replacement (CPT 23472) 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 | Gregory Nicholson, M.D. | Chicago, IL | 90 |
| 2 | Aaron Bare, MD | Warrenville, IL | 77 |
| 3 | Robert Thorsness, M.D. | Joliet, IL | 70 |
| 4 | Rolando Izquierdo, M.D. | Algonquin, IL | 70 |
| 5 | Grant Garrigues, M.D. | Chicago, IL | 66 |
| 6 | Brent Johnson, M.D. | Peoria, IL | 57 |
| 7 | Miguel Ramirez, MD | Peoria, IL | 53 |
| 8 | Scott Trenhaile, M.D. | Rockford, IL | 53 |
| 9 | Michael Merkley, M.D. | Peoria, IL | 53 |
| 10 | Guido Marra, MD | Chicago, IL | 51 |
75 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 Total Shoulder Replacement in Illinois?
- 85 Illinois providers billed Medicare for Total Shoulder Replacement (CPT 23472) 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.