Largest groups
| Group | City | Clinicians |
|---|---|---|
| Northwestern Medical Faculty Foundation | Chicago | 302 |
| Advocate Health And Hospitals Corporation | Oak Lawn | 228 |
| Endeavor Health Medical Group | Evanston | 166 |
| Northstar Anesthesia Of Illinois, LLC | Chicago Heights | 149 |
| North American Partners In Anesthesia Illinois LLC | Berwyn | 121 |
| University Of Chicago | Chicago | 114 |
| Midwest Anesthesia Partners LLC | Chicago | 98 |
| Loyola University Medical Center | Maywood | 66 |
| Associated Anesthesiologists SC | Peoria | 60 |
| The Board Of Trustees Of The University Of Illinois | Chicago | 55 |
| Dupage Valley Anesthesiologists LTD | Naperville | 55 |
| Midwest Anesthesia Providers SC | Belleville | 52 |
| University Anesthesiologists SC | Chicago | 48 |
| Mobile Anesthesiologists Chicago LLC | Rosemont | 46 |
| Clinical Colleagues INC | Rock Island | 42 |
| Carle Health Care Incorporated | Urbana | 42 |
| Rockford Health Physicians | Rockford | 36 |
| Cook County | Chicago | 29 |
| Rockford Anesthesiologists Associated LLC | Rockford | 27 |
| Memorial Medical Center | Springfield | 22 |
| Barrington Anesthesia Associates, SC | Barrington | 20 |
| Midwest Anesthesiologists LTD | Hazel Crest | 19 |
| Methodist Medical Center Of Illinois | Peoria | 19 |
| Encore Anesthesia Group LLC | Melrose Park | 19 |
| Ucm Medical Group Sub LLC | Harvey | 18 |
Group size mix
| Clinicians per group ID | Group IDs |
|---|---|
| 1 | 47 |
| 2 to 4 | 38 |
| 5 to 9 | 15 |
| 10 to 24 | 20 |
| 25 or more | 19 |
Source: CMS Doctors and Clinicians National Downloadable File. Counts are Medicare enrollment records, not a full census.
