Memorial Hermann ACO (Houston). Since July 2012, Memorial Hermann has participated in the Medicare Shared Savings Program. Its Medicare ACO spans nearly 130 provider practices. It held the No. 1 spot among 333 MSSP ACOs in 2014 for shared savings, bringing home a total of $22.72 million. The ACO is in a partnership with Aetna, called Aetna Whole Health, which has been in the works since 2013. That September, it also signed a contract with Blue Cross and Blue Shield of Texas. Most recently, Memorial Hermann added another commercial ACO with UnitedHealthcare that covers 120,000 people.
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