Advocate Health Care (Downers Grove, Ill.). Advocate first began testing the ACO waters in a 2010 value-based contract with Blue Cross Blue Shield of Illinois. Two years later, it joined the Medicare Shared Savings Program, which now boasts nearly 280 participating practices. In 2014, Advocate rolled out an ACO agreement with UnitedHealthcare, which it expanded in 2015 from 5,500 beneficiaries to more than 80,000.
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