Episode Treatment Groups (ETGs): a patient classification system for measuring outcomes performance by episode of illness.

The Episode Treatment Group (ETG) methodology is a patented case-mix adjustment and episode-building system that uses routinely collected inpatient and ambulatory claims data. The resulting clinically homogenous groups, of which there are approximately 600, adjust for severity by the presence of complicating conditions, comorbidities, and other characteristics of a patient's condition that affect resource utilization.