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Analyzing shifts in economic risks to providers in proposed payment and delivery system reforms.

A key consideration in implementing the Patient Protection and Affordable Care Act of 2010 will be changing Medicare payments to providers to slow the growth in costs and spur improvements in health care delivery. In addition to the technical feasibility of new payment models, a crucial issue will be the capacity of the health care system to assume more economic risk. This article analyzes some of the major models under consideration and assesses how feasible their implementation would be.