Mittel A, Kim DH, Cooper Z, et al. - Researchers here examined if hospital performance could be better determined through 90-day mortality rates, which are not publicly reported but better capture postdischarge mortality. This retrospective cohort analysis of 30- vs 90-day risk-standardized mortality rates was performed at adult cardiac surgical centers in New York State from 2008 to 2014. Use of a 90-day mortality metric in a cohort of patients who underwent coronary artery bypass grafting surgery from 2008 to 2014 in New York State led to a change in hospital quality assessment for a minority of hospitals. Findings suggest no additional value of using 90-day mortality when evaluating institutional performance for this population.