Lyons TW, et al. - Physicians designed this study to identify the population of patients seeking care at multiple emergency departments (EDs) and to quantify the proportion of all ED visits and costs accounted for by these patients. They concluded that substantial minority of patients visited multiple EDs, but accounted for a disproportionate burden of overall ED utilization and costs. Future work needed to assess the effect of visiting multiple EDs on care utilization and outcomes and explore systems for improving access to patient records across care centers.