摘要To the Editor:In 1983,a new prospective case-based reimbursement system called diagnosis-related groups (DRGs) emerged in the United States.Since then,this payment system has been widely applied by other developed countries,such as Australia,Germany,France,Finland,and Japan,in the form of a well-functioning DRG-based prospective payment system (PPS).[1-4]Beijing's Basic Medical Insurance (BBMI) scheme was launched in 2001,and its main task has been gradually covered all residents recorded on household register,including urban employees,rural residents,the elderly,children,and the unemployed.With the rapid coverage expansion of the insured crowd,the increasing rate of medical expenses has far exceeded the growth rate of the insurance tax,and the overall health insurance fund is in an imbalanced state.