| 1925 E RAND LLC | Organization | ARLINGTON HEIGHTS |
| A & M MEDICAL GROUP PLLC | Organization | NILES |
| ABSOLUTECARE OF ILLINOIS, PLLC | Organization | CHICAGO |
| ACTIVE HEALTH CENTERS, LTD. | Organization | CHICAGO |
| ACTIVE HEALTHCARE, LTD | Organization | CHICAGO |
| ACTIVE MEDICAL NAPERVILLE LTD | Organization | NAPERVILLE |
| ACUPUNCTURE & CHIROPRACTIC CENTER | Organization | SPRINGFIELD |
| ADVANCED CARE & TREATMENT MEDICAL GROUP | Organization | ROCKFORD |
| ADVANCED PHYSICAL MEDICINE OF YORKVILLE, LTD | Organization | YORKVILLE |
| ADVANCED PHYSICIAN SERVICES | Organization | NAPERVILLE |
| ADVANCED URGENT CARE LTD | Organization | ORLAND PARK |
| ADVENTIST HEALTH PARTNERS, INC. | Organization | LA GRANGE |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | CHICAGO |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | OAK BROOK |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | OAK LAWN |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | AURORA |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | AURORA |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | AURORA |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | CHICAGO |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | GURNEE |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | LINCOLNSHIRE |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | CHICAGO |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | LAKEMOOR |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | SOUTH ELGIN |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | CHICAGO |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | GURNEE |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | WILMETTE |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | PARK RIDGE |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | DOWNERS GROVE |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | SOUTH HOLLAND |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | CHICAGO |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | LAKE ZURICH |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | WESTMONT |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | NAPERVILLE |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | LIBERTYVILLE |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | CHICAGO |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | LAKE VILLA |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | AURORA |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | OSWEGO |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | SKOKIE |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | HOFFMAN ESTATES |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | BATAVIA |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | CHICAGO |
| ADVOCATE HEALTH AND HOSPITALS CORPORATION | Organization | CHICAGO |
| ADVOCATE HEALTH CENTERS, INC. | Organization | CHICAGO |
| AESTHETIC CARE SOLUTIONS LLC | Organization | CHICAGO RIDGE |
| ALIVIO MEDICAL CENTER, INC. | Organization | CHICAGO |
| ALLEN'S FAMILY COUNSELING | Organization | CHICAGO |
| ALPHA PERFORMANCE MEDICINE S.C. | Organization | SWANSEA |
| ALTON MEMORIAL PHYSICIAN BILLING SERVICES LLC | Organization | ALTON |
| AMANA BEHAVIORAL HEALTH | Organization | CHICAGO |
| AMERICAN PHYSICIAN GROUP INC | Organization | SKOKIE |
| ANDA THERAPY GROUP | Organization | CHICAGO |
| ANDRE ALLEN, CEO | Individual | OLYMPIA FIELDS |
| APEX PHYSICAL THERAPY LLC | Organization | GRANITE CITY |
| APEX PHYSICAL THERAPY, LLC | Organization | COLLINSVILLE |
| ARGOT HEALTH LLC | Organization | CHICAGO |
| ARIANA CONEJO GUTIERREZ | Individual | ELGIN |
| ARVIND PATEL M.D.S.C. | Organization | DES PLAINES |
| ARVIND PATEL M.D.S.C. | Organization | DES PLAINES |