| SPRINGFIELD CLINIC ASC | SPRINGFIELD | 4685 | No Different Than the National Rate |
| GLEN ENDOSCOPY CENTER LLC | GLENVIEW | 4122 | No Different Than the National Rate |
| CENTRAL ILLINOIS ENDOSCOPY CENTER LLC | PEORIA | 4115 | No Different Than the National Rate |
| SURGICAL CENTER OF DUPAGE MEDICAL GROUP | LOMBARD | 3953 | No Different Than the National Rate |
| ROCKFORD GASTROENTEROLOGY ASSOCIATES LTD | ROCKFORD | 3526 | No Different Than the National Rate |
| ELGIN GASTROENTEROLOGY ENDOSCOPY CENTER LLC | ELGIN | 2940 | No Different Than the National Rate |
| CENTER FOR DIGESTIVE HEALTH | BOURBONNAIS | 2840 | No Different Than the National Rate |
| OAK LAWN ENDOSCOPY | OAKLAWN | 2829 | No Different Than the National Rate |
| RSC ILLINOIS LLC DBA REGIONAL SURGICENTER | MOLINE | 2542 | No Different Than the National Rate |
| MIDWEST ENDOSCOPY CENTER LLC | NAPERVILLE | 2495 | No Different Than the National Rate |
| DIGESTIVE DISEASE ENDOSCOPY CENTER | NORMAL | 2331 | No Different Than the National Rate |
| DREYER MEDICAL AMBULATORY SURGERY CENTER | AURORA | 2106 | No Different Than the National Rate |
| NORTHWEST ENDO CENTER LLC | ARLINGTON HEIGHTS | 1859 | No Different Than the National Rate |
| QUINCY PHYSICIANS SURGEONS CLINIC DBA QUINCY MEDICAL GROUP SURGERY CENTER | QUINCY | 1793 | No Different Than the National Rate |
| NORTH SHORE ENDOSCOPY CENTER | LAKE BLUFF | 1784 | No Different Than the National Rate |
| VALLEY AMBULATORY SURGERY CENTER | ST CHARLES | 1499 | No Different Than the National Rate |
| JOLIET SURGERY CENTER LIMITED PARTNERSHIP | JOLIET | 1362 | No Different Than the National Rate |
| PRESENCE LAKESHORE GASTROENTEROLOGY DBA DES PLAINES ENDOSCOPY CENTER | DES PLAINES | 1141 | No Different Than the National Rate |
| EFFINGHAM SURGICAL PARTNERS LLC | EFFINGHAM | 1119 | No Different Than the National Rate |
| EASTLAND MEDICAL PLAZA SURGICENTER LLC | BLOOMINGTON | 907 | No Different Than the National Rate |
| MIDWEST CENTER FOR DAY SURGERY | GROVE | 888 | No Different Than the National Rate |
| MARION HEALTHCARE LLC | MARION | 845 | No Different Than the National Rate |
| CARLE SURGICENTER | CHAMPAIGN | 797 | No Different Than the National Rate |
| PALOS SURGICENTER LLC | PALOS HEIGHTS | 790 | No Different Than the National Rate |
| HOFFMAN ESTATES SURGERY CENTER LLC | HOFFMAN ESTATES | 786 | No Different Than the National Rate |