Medicare physician payment, participation, and reform.
D002204:Capitation Fee; D004470:Economics, Medical / Q000639:trends*; D005245:Fee Schedules; D005102:Health Expenditures / Q000639:trends*; D006801:Humans; D007357:Insurance, Physician Services / Q000191:economics*; D008484:Medicaid / Q000191:economics; D006278:Medicare / Q000191:economics*; D011445:Prospective Payment System; D014481:United States