Which of the Following Statements Is True About Diagnosis-Related Groups

Which of the following statements is true about diagnosis-related groups (DRGs) ?

A) DRGs are the basis for a cost accounting method that groups costs together by departments performing the services.
B) A DRG is a case-mix classification scheme that is used to determine the payment provided to the hospital for inpatient services,regardless of how much the hospital spends to treat a patient.
C) The federal Medicare system of retroactive payment for services depends on DRGs.
D) The DRGs method is the prevailing practice of billing third-party payors for a health care organization's average cost for providing care for locally defined similar medical conditions.