| ABLE HOME SLEEP CENTERS, LLC | Organization | CRYSTAL LAKE |
| ADVANCED SLEEP INSTITUTE LLC | Organization | CARBONDALE |
| ALTERNATIVE SLEEP DISORDERS CENTER | Organization | ALGONQUIN |
| ANTHONY PROSKE MD LTD | Organization | JOLIET |
| ASN, INC. | Organization | WESTMONT |
| ATIC ONE S.C. | Organization | LIBERTYVILLE |
| BETTER SLEEP CENTER OF HINSDALE, INC. | Organization | HINSDALE |
| BETTER SUNRISE CORPORATION | Organization | PARK RIDGE |
| BIOSERENITY DT INC. | Organization | ELMHURST |
| CARDINAL SLEEP CENTERS OF AMERICA LLP | Organization | JOLIET |
| CHC SLEEP SOLUTIONS LLC | Organization | CHICAGO |
| CHICAGO LIPO LASER, LLC | Organization | CHICAGO |
| CLEAR VIEW IMAGING LLC | Organization | MARION |
| DELTA SLEEP | Organization | WOODRIDGE |
| DELTA SLEEP'S CPAP STORE | Organization | BLOOMINGTON |
| DIGITRACE CARE SERVICES | Organization | BARRINGTON |
| DIGITRACE CARE SERVICES, INC | Organization | CHICAGO |
| DIGITRACE CARE SERVICES, INC | Organization | OAK LAWN |
| DIGITRACE CARE SERVICES, INC | Organization | ORLAND PARK |
| DIGITRACE CARE SERVICES, INC | Organization | HOFFMAN ESTATES |
| ELSTON MANAGEMENT CORPORATION | Organization | CHICAGO |
| FIRST STEP HOME SLEEP TESTING INC. | Organization | TUSCOLA |
| FOX VALLEY MEDICAL DIAGNOSTIC SERVICES INC. | Organization | AURORA |
| FUTURE SLEEP SOLUTIONS | Organization | GURNEE |
| GLOBAL SLEEP CENTERS INC | Organization | CHICAGO |
| GOOD NIGHT SLEEP CENTER LLC | Organization | MORRIS |
| HOME SLEEP DIAGNOSTICS | Organization | CHICAGO |
| KEY HEALTH SOLUTIONS INC | Organization | BLOOMINGDALE |
| LION SLEEP LABS INC | Organization | GLEN CARBON |
| MEADOWS SLEEP DISORDERS CLINIC, INC | Organization | HOFFMAN ESTATES |
| MEDTEK DIAGNOSTICS INC | Organization | BLOOMINGDALE |
| MERIT CENTER FOR SLEEP HEALTH OF ARLINGTON HEIGHTS LLC | Organization | ARLINGTON HEIGHTS |
| MERIT CENTER FOR SLEEP HEALTH OF CHICAGO LAKESHORE, LLC | Organization | CHICAGO |
| MERIT CENTER FOR SLEEP HEALTH OF ELMHURST, LLC | Organization | ELMHURST |
| MERIT CENTER FOR SLEEP HEALTH OF LOMBARD, LLC | Organization | LOMBARD |
| MERIT CENTER FOR SLEEP HEALTH OF OAK PARK, LLC | Organization | RIVER FOREST |
| MERIT CENTER FOR SLEEP HEALTH OF PRAIRIE STONE, LLC | Organization | HOFFMAN ESTATES |
| MERIT CENTER FOR SLEEP HEALTH OF ST. CHARLES, LLC | Organization | ST CHARLES |
| MERIT CENTER FOR SLEEP HEALTH OF STREAMWOOD LLC | Organization | STREAMWOOD |
| MIDWEST CENTER FOR SLEEP MEDICINE, LLC | Organization | BLOOMINGTON |
| MIDWEST SLEEP ASSOCIATES, LLC | Organization | AURORA |
| MIDWEST SLEEP ASSOCIATES, LLC. | Organization | YORKVILLE |
| MIDWEST SLEEP INC | Organization | EFFINGHAM |
| MOBILE MEDICAL MONITORS, LLC | Organization | HERRIN |
| MRB HEALTHCARE SERVICES LLC | Organization | MORTON GROVE |
| NAPERVILLE CENTER FOR SLEEP HEALTH LLC | Organization | NAPERVILLE |
| NORTHERN ILLINOIS SLEEP CENTER, S.C | Organization | SYCAMORE |
| NORTHSHORE SLEEP MEDICINE, S.C. | Organization | NORTHBROOK |
| ORAWIN TECHNOLOGY | Organization | ELBURN |
| OTTAWA REGIONAL CARDINAL SLEEP CENTER, LLC | Organization | OTTAWA |
| PREFERRED SLEEP LABS, LLC | Organization | GLENVIEW |
| REM SLEEP LAB | Organization | BREESE |
| RES - HEALTH SLEEP CARE CENTER OF RIVER FOREST, LLC | Organization | RIVER FOREST |
| RES-HEALTH SLEEP CARE CENTER OF CHICAGO NORTHWEST, LLC | Organization | CHICAGO |
| RES-HEALTH SLEEP CARE CENTER OF EVANSTON, LLC | Organization | EVANSTON |
| RES-HEALTH SLEEP CARE CENTER OF LINCOLN PARK, LLC | Organization | CHICAGO |
| SKOKIE OPERATING COMPANY LLC | Organization | SKOKIE |
| SLEEP AND BEHAVIOR MEDICINE INSTITUTE | Organization | VERNON HILLS |
| SLEEP CENTER OF CENTRAL ILLINOIS LLC | Organization | BLOOMINGTON |
| SLEEP CENTERS OF AMERICA INC | Organization | CHICAGO |