Diagnosis-related groups.
D000368:Aged; D003953:Diagnosis-Related Groups; D005260:Female; D006801:Humans; D007350:Insurance, Hospitalization / Q000191:economics*; D008297:Male; D006278:Medicare / Q000191:economics*; D008875:Middle Aged; D012051:Reimbursement Mechanisms; D014481:United States