The 10 largest medical groups in Illinois by physicians
Dreyer Medical Clinic (Advocate Medical Group) is the largest medical group in Illinois, with 3,546 physicians, followed by Northwestern Medical Faculty Foundation in Chicago (3,474) and Endeavor Health Medical Group in Evanston (3,394).
- Dreyer Medical Clinic (Advocate Medical Group)3,546physicians5,346HCPs
- Northwestern Medical Faculty Foundation3,474physicians5,686HCPs
- Endeavor Health Medical Group3,394physicians5,502HCPs
- OSF Multi-Specialty Group2,053physicians3,477HCPs
- University of Illinois Physicians Group (UIPG)1,747physicians2,424HCPs
- UChicago Medicine Physicians1,716physicians2,711HCPs
- Carle Physician Group1,632physicians2,759HCPs
- UChicago Medicine Physicians (University of Chicago Physicians Group)1,599physicians2,472HCPs
- Rush University Internists1,547physicians2,463HCPs
- Select Rehabilitation1,495physicians2,450HCPs
The 10 largest of 2,357 Illinois medical groups that report physicians. Ranks compare size, not quality of care.
Every medical group in IllinoisThe median Illinois medical group has 3 physicians
2,357 Illinois medical groups report physicians. The median medical group has 3 physicians, so Dreyer Medical Clinic (Advocate Medical Group) is about 1,182 times that size.
- the size of the median Illinois medical group, which has 3 physicians
- 1,182×
- of the 2,357 Illinois medical groups that report physicians
- 0.4%
How we ranked the largest Illinois medical groups
- Measure
- Physicians linked to each group in CMS enrollment and the Dmand AI database.
- What counts as a group
- One Medicare PAC ID. A group that bills under several names counts once.
- Field
- 2,357 Illinois medical groups in the Dmand AI database report physicians.
- Ties
- Medical groups with the same number share a rank.
- HCPs
- Healthcare professionals with a current link to the group in the Dmand AI database.
- What a rank means
- Size only. A rank compares physicians; it says nothing about quality of care.
- Refresh
- Monthly. Updated Oct 28, 2026.
FAQ
Questions about the largest Illinois medical groups
Answers from the same data, updated monthly.
What is the largest medical group in Illinois?
Dreyer Medical Clinic (Advocate Medical Group) in Aurora, with 3,546 physicians. Northwestern Medical Faculty Foundation is second with 3,474.
What are the 10 largest medical groups in Illinois?
By physicians: Dreyer Medical Clinic (Advocate Medical Group) (3,546), Northwestern Medical Faculty Foundation (3,474), Endeavor Health Medical Group (3,394), OSF Multi-Specialty Group (2,053), University of Illinois Physicians Group (UIPG) (1,747), UChicago Medicine Physicians (1,716), Carle Physician Group (1,632), UChicago Medicine Physicians (University of Chicago Physicians Group) (1,599), Rush University Internists (1,547), Select Rehabilitation (1,495).
How many physicians does a typical Illinois medical group have?
The median Illinois medical group that reports physicians has 3 physicians, out of 2,357 that report them.
How often is this list updated?
Every month, when the Dmand AI database refreshes. This version is from Oct 28, 2026.
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