Recent changes in Medicare payments for ambulatory clinical diagnostic tests.
D000368:Aged; D000553:Ambulatory Care / Q000191:economics*; D003954:Diagnostic Services / Q000191:economics*; D005245:Fee Schedules; D006801:Humans; D006278:Medicare / Q000191:economics*; D011445:Prospective Payment System; D012051:Reimbursement Mechanisms; D014481:United States