Much of the data in ProPublica's ER Inspector interactive database comes from CMS's Timely and Effective Care datasets. While ER Inspector only uses hospital level data, it is also provided at the state and national level.

This data set includes hospital-level data for measures of cataract surgery outcome, colonoscopy follow-up, heart attack care, emergency department care, preventive care, blood clot prevention, pregnancy and delivery care, and cancer care.