Below are the 30 largest ACOs, including those participating in the Pioneer program, the Medicare Shared Savings Program and those with commercial contracts, by physician participation.
1. Partners Healthcare (Boston) — 3,727 participating physicians
2. Valley Preferred Aetna (Allentown, Pa.) — 3,533
3. Hill Physicians, Dignity Health and UCSF Health Net (San Ramon, Calif.) — 3,279
4. Heritage California ACO (Northridge, Calif.) — 3,099
5. Hill Physicians, Dignity Health and CalPers ACO (San Ramon, Calif.) — 3,081
6. Indiana University Health ACO, Inc. (Indianapolis) — 2,884
7. Hill Physicians, St. Mary’s MedicalCenter, Saint Francis Memorial Hospital and UCSFMedicalCenter Blue Shield (San Francisco) — 2,843
8. Cleveland Clinic and Cigna ACO — 2,723
9. Baylor Quality Alliance (Dallas) — 2,723
10. Aurora Health Accountable Care Network and Aetna (Milwaukee) — 2,188
11. Montefiore Accountable Care Organization (Bronx, N.Y.) — 2,173
12. Family Care, Inc. (Portland) — 2,091
13. Carolinas Healthcare System (Charlotte, N.C.) —2,075
14. Mercy Clinic, MercyHospitalSpringfield and Mercy Clinic Springfield (Chesterfild, Mo.) —2,009
15. Northwest Metro Alliance (Bloomington, Minn.) — 1,891
16. Advocate Physician Partners Accountable Care, Inc. (Rolling Meadows, Ill.) — 1,835
17. Heritage Provider Network and Blue Cross ACO (Northridge, Calif.) — 1,825
18. Renaissance Physician Organization (Houston) — 1,776
19. Banner Health Network (Mesa, Ariz.) — 1,769
20. Iowa Health Accountable Care (West Des Moines) — 1,682
21. Brown & Toland Physicians ACO (San Francisco) — 1,655
22. Penn Medicine and Independence Blue Cross (Philadelphia) — 1,614
23.Valley Preferred and Cigna (Allentown, Pa.) — 1,590
24. Trinity Pioneer ACO (Fort Dodge, Iowa) — 1,565
25. Brown & Toland Physicians and Cigna (San Francisco) — 1,542
26. Brown & Toland Physicians and Blue Shield (San Francisco) — 1,542
27. OneCare Vermont ACO (Colchester) — 1,540
28. Bon Secours Good Helpcare (Marriottsville, Md.) — 1,531
29. University of Michigan Health System (Ann Arbor) — 1,503
30. UniversityHospitals and Cigna (Shaker Heights, Ohio) — 1,500
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