In America, Prospective Payment System (PPS) that was put into practice in 1983 is developed based on DRGs. American medical expenses increased by two-digit numbers every year before 1990, and decreased to one-digit after 199O.

• 如美国1983年开始实施的预付款制度(Prospective Payment System,PPS)就是以DRGs为基础发展起来的。