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Medicare Part B: rising assignment rates, rising costs.

In this paper I examine the access, quality, and cost trade-offs of assignment under Part B of the Medicare program for both participating and nonparticipating practices, and discuss the impact of assignment on both physician and patient choices. I also discuss the assignment options, or variants of assignment, that have been pursued and that might be considered for future implementation to curb increases in physician costs. Although one frequently suggested alternative--mandatory assignment--would reduce much of the uncertainty surrounding physician costs and reduce some of the out-of-pocket costs of the elderly, it could promote a two-tier system of care by reducing quality for Medicare beneficiaries, and may produce increases in government expenditures.