The Healthcare Cost and Utilization Project Kids Inpatient Dataset 2009 identified pediatric discharges. The Healthcare Information and Management Systems Society 2009 database identified hospitals' EMR use. EMR was classified into 3 stages, with advanced-stage 3 EMR including automation of ancillary services, automation of nursing workflow, computerized provider order entry, and clinical decision support. Multivariable linear regression was used to determine the independent effect of advanced-stage EMR on cost per case. Propensity score adjustment was included to control for nonrandom assignment of EMR use.