| 1800 MCDONOUGH ROAD SURGERY CENTER LLC | HOFFMAN ESTATES | — |
| ADVANCED AMBULATORY SURGICAL CENTER INC | CHICAGO | — |
| ADVOCATE CONDELL AMBULATORY SURGERY CENTER LLC | LIBERTYVILLE | — |
| AGHAPY SURGICAL CENTER SC | BARRINGTON | — |
| AIDEN CENTER FOR DAY SURGERY LLC | ADDISON | — |
| ALGONQUIN ROAD SURGERY CENTER LLC | LAKE IN THE HILLS | — |
| AMBULATORY SURGERY CENTER OF CENTRALIA LLC | CENTRALIA | — |
| ANDERSON SURGERY CENTER LLC | EDWARDSVILLE | — |
| ARLINGTON HEIGHTS SURGERY CENTER LLC | ARLINGTON HEIGHTS | — |
| ASCENSION SAINT JOSEPH MSK JV LLC | CHICAGO | — |
| ASSOCIATED SURGICAL CENTER LLC | ARLINGTON HEIGHTS | — |
| BARRINGTON PAIN AND SPINE INSTITUTE LLC | BARRINGTON | — |
| BEL CLAIR AMBULATORY SURGICAL TREATMENT CENTER LTD | BELLEVILLE | — |
| BELMONT HARLEM SURGERY CENTER LLC | CHICAGO | — |
| BLOOMINGTON EYE INSTITUTE LLC | BLOOMINGTON | — |
| BLOOMINGTON NORMAL HEALTHCARE LLC | NORMAL | — |
| CADENCE AMBULATORY SURGERY CENTER LLC | WARRENVILLE | — |
| CARLE SURGICENTER | CHAMPAIGN | — |
| CENTER FOR DIGESTIVE HEALTH | BOURBONNAIS | — |
| CENTER FOR HEALTH AMBULATORY SURGERY CENTER LLC | PEORIA | — |
| CENTER FOR MINIMALLY INVASIVE SURGERY | MOKENA | — |
| CENTRAL ILLINOIS ENDOSCOPY CENTER LLC | PEORIA | — |
| CHICAGO VASCULAR ASC LLC | WESTMONT | — |
| DANVILLE POLYCLINIC LTD | DANVILLE | — |
| DEERPATH AMBULATORY SURGICAL CENTER LLC | MORRIS | — |
| DIGESTIVE DISEASE ENDOSCOPY CENTER | NORMAL | — |
| DREYER MEDICAL AMBULATORY SURGERY CENTER | AURORA | — |
| DUPAGE EYE SURGERY CENTER LLC | WHEATON | — |
| DUPAGE MEDICAL GROUP SURGERY CENTER OF WESTMONT | WESTMONT | — |
| EASTLAND MEDICAL PLAZA SURGICENTER LLC | BLOOMINGTON | — |
| EDWARDSVILLE AMBULATORY SURGERY CENTER LLC | GLEN CARBON | — |
| EFFINGHAM SURGICAL PARTNERS LLC | EFFINGHAM | — |
| ELGIN GASTROENTEROLOGY ENDOSCOPY CENTER LLC | ELGIN | — |
| ELMHURST OUTPATIENT SURGERY CENTER LLC | ELMHURST | — |
| EYE SURGERY CENTER LLC | BELLEVILLE | — |
| FOX VALLEY ORTHOPAEDIC ASSOCIATES SC | GENEVA | — |
| FULLERTON KIMBALL MEDICAL SURGICAL CENTER | CHICAGO | — |
| FULLERTON SURGERY CENTER | CHICAGO | — |
| FULLERTON SURGERY CENTER INC | CHICAGO | — |
| GAILEY EYE SURGERY DECATUR | DECATUR | — |
| GASTROINTESTINAL INSTITUTE LLC | NORMAL | — |
| GLEN ENDOSCOPY CENTER LLC | GLENVIEW | — |
| GOLD COAST SURGICENTER | CHICAGO | — |
| HAUSER ROSS AMBULATORY SURGICAL CENTER | SYCAMORE | — |
| HAWTHORN SURGERY CENTER | VERNON HILLS | — |
| HINSDALE SURGICAL CENTER | HINSDALE | — |
| HOFFMAN ESTATES SURGERY CENTER LLC | HOFFMAN ESTATES | — |
| HYDE PARK SURGICAL CENTER DBA HYDE PARK SAME DAY SURGICENTER | CHICAGO | — |
| HYDE PARK SURGICAL CENTER LLC | CHICAGO | — |
| ILLINOIS SPORTS MEDICINE AND ORTHOPEDIC SURGERY CENTER | MORTON GROVE | — |
| INGALLS SAME DAY SURGERY CENTER LTD PTR | TINLEY PARK | — |
| IRELAND GROVE CENTER FOR SURGERY LLC | BLOOMINGTON | — |
| JOLIET SURGERY CENTER LIMITED PARTNERSHIP | JOLIET | — |
| JUSTICE MED SURG CENTER LTD | JUSTICE | — |
| KENDALL POINTE SURGERY CENTER LLC | OSWEGO | — |
| LGH A GOLF ASTC LLC DBA GOLF SURGICAL CENTER | DES PLAINES | — |
| LINDENHURST SURGERY CENTER LLC | LINDENHURST | — |
| LOYOLA AMBULATORY SURGERY CENTER AT OAKBROOK LP | OAKBROOK TERRACE | — |
| MARION EYE SURGERY CENTER LLC | MOUNT VERNON | — |
| MARION HEALTHCARE LLC | MARION | — |
| METROEAST ENDOSCOPIC SURGERY CENTER | FAIRVIEW HEIGHTS | — |
| MIDLAND SURGICAL CENTER LLC | SYCAMORE | — |
| MIDWEST CENTER FOR DAY SURGERY | GROVE | — |
| MIDWEST ENDOSCOPY CENTER LLC | NAPERVILLE | — |
| MIDWEST EYE CENTER | CALUMET CITY | — |
| NAPERVILLE SURGICAL CENTRE | NAPERVILLE | — |
| NILES SURGERY CENTER LLC | NILES | — |
| NORTH SHORE ENDOSCOPY CENTER | LAKE BLUFF | — |
| NORTH SHORE SAME DAY SURGERY DBA NORTH SHORE SURGICAL CENTER | LINCOLNWOOD | — |
| NORTHWEST COMMUNITY DAY SURGERY CENTER II LLC | ARLINGTON HEIGHTS | — |
| NORTHWEST COMMUNITY FOOT AND ANKLE CENTER LLC | DES PLAINES | — |
| NORTHWEST ENDO CENTER LLC | ARLINGTON HEIGHTS | — |
| NOVAMED EYE SURGERY CENTER OF MARYVILLE LLC DBA EYES OF ILLINOIS SURGERY CENTER | MARYVILLE | — |
| NOVAMED SURGERY CENTER OF CHICAGO NORTHSHORE LLC | CHICAGO | — |
| NOVAMED SURGERY CENTER OF OAK LAWN LLC DBA CENTER FOR RECONSTRUCTIVE SURGERY | OAK LAWN | — |
| NOVAMED SURGERY CENTER OF RIVER FOREST LLC | RIVER FOREST | — |
| OAK ASC LLC | BOURBONNAIS | — |
| OAK BROOK SURGICAL CENTRE INC | OAK BROOK | — |
| OAK LAWN ENDOSCOPY | OAKLAWN | — |
| OFALLON SURGICAL CENTER LLC DBA PHYSICIANS SURGICAL CENTER | OFALLON | — |
| OLYMPIAN SURGICAL SUITES | CHAMPAIGN | — |
| OPHTHALMOLOGY SURGERY CENTER OF ILLINOIS LLC | ITASCA | — |
| ORTHOILLINOIS SURGERY CENTER ELGIN LLC | ELGIN | — |
| ORTHOPAEDIC SURGERY CENTER OF ILLINOIS LLC | SPRINGFIELD | — |
| PAIN CARE SURGERY PC | MARION | — |
| PAIN MANAGEMENT SURGICAL CENTER OF DU PAGE MEDICAL GROUP | NAPERVILLE | — |
| PALOS HEALTH SURGERY CENTER | ORLAND PARK | — |
| PALOS HILLS SURGERY CENTER | PALOS HILLS | — |
| PALOS SURGICENTER LLC | PALOS HEIGHTS | — |
| PCAC GI JV LLC DBA AMITA HEALTH ENDOSCOPY CENTER LINCOLN PARK | CHICAGO | — |
| PEORIA AMBULATORY SURGERY | PEORIA | — |
| PHYSICIANS SURGERY CENTER AT GOOD SAMARITAN LLC | MOUNT VERNON | — |
| PHYSICIANS SURGERY CENTER LLC | CARBONDALE | — |
| PLAINFIELD SURGERY CENTER LLC | PLAINFIELD | — |
| PREFERRED SURGICENTER LLC | ORLAND PARK | — |
| PREMIER CARDIOCASCULAR SURGERY CENTER | MERRIONETTE PARK | — |
| PRESENCE LAKESHORE GASTROENTEROLOGY DBA DES PLAINES ENDOSCOPY CENTER | DES PLAINES | — |
| QUAD CITY AMBULATORY SURGERY CENTER LLC | MOLINE | — |
| QUINCY PHYSICIANS SURGEONS CLINIC DBA QUINCY MEDICAL GROUP SURGERY CENTER | QUINCY | — |
| RAVINE WAY SURGERY CENTER LLC | GLENVIEW | — |