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Affordable Care Act establishes a Medicare Shared Savings Program (MSSP) designed to drive efficient, high-quality care for Medicare fee-for-service beneficiaries. Under this program, groups of health care providers can form accountable care organizations (ACOs). These ACOs agree to be accountable for the quality, cost, and overall care of Medicare beneficiaries assigned to them. At the end of March 2011, the Obama Administration released proposed regulations for the MSSP.