From Fierce Healthcare August 17, 2012 | By Ron Shinkman

More than 2 million Medicare beneficiaries now are enrolled in accountable care organizations, and their ranks continue to grow, according to a new survey by the Commonwealth Fund. However, Kaiser Health News reported that many hospitals may not yet be ready to assume the financial risks of an ACO operation.

According to the report, 2.4 million Medicare enrollees are involved in some form of ACO. Altogether, there were 221 ACOs in 45 states as of May. Of those, 148 are Medicare-oriented, with the rest serving private sector patients.

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