The ground for change: Medicare.
D005380:Financing, Government; D007342:Insurance Benefits; D006278:Medicare / Q000191:economics* / Q000331:legislation & jurisprudence; D011445:Prospective Payment System / Q000331:legislation & jurisprudence*; D012051:Reimbursement Mechanisms / Q000331:legislation & jurisprudence*; D014481:United States