Season of change for health services.
D003365:Costs and Cost Analysis; D006291:Health Policy; D006296:Health Services / Q000191:economics*; D006801:Humans; D008484:Medicaid / Q000331:legislation & jurisprudence*; D006278:Medicare / Q000331:legislation & jurisprudence*; D011366:Professional Review Organizations / Q000331:legislation & jurisprudence; D012051:Reimbursement Mechanisms / Q000191:economics; D014481:United States