APGs (ambulatory patient groups) are on the way.
Gaskill
M
M
D000553:Ambulatory Care / Q000145:classification*; D014487:Centers for Medicare and Medicaid Services, U.S.; D003953:Diagnosis-Related Groups / Q000145:classification*; D006801:Humans; D011445:Prospective Payment System / Q000458:organization & administration*; D014481:United States