By the numbers. Medicare/Medicaid.
D039702:Current Procedural Terminology; D003625:Data Collection; D003953:Diagnosis-Related Groups / Q000145:classification* / Q000191:economics; D006801:Humans; D038801:International Classification of Diseases; D008484:Medicaid / Q000706:statistics & numerical data*; D006278:Medicare / Q000706:statistics & numerical data*; D014481:United States