• Theodoros V Giannouchos, David J Washburn, Hye-Chung Kum, William M Sage, and Robert L Ohsfeldt.
• Department of Health Policy & Management, School of Public Health.
• Med Care. 2020 Feb 1; 58 (2): 137-145.

BackgroundResearch on frequent emergency department (ED) use shows that a subgroup of patients visits multiple EDs. This study characterizes these individuals.ObjectiveThe objective of this study was to determine how many frequent ED users seek care at multiple EDs and to identify sociodemographic, clinical, and contextual factors associated with such behavior.Research DesignWe used the 2011-2014 Healthcare Cost and Utilization Project State Emergency Department Databases data on all outpatient ED visits in New York, Massachusetts, and Florida. We studied all adult ED users with ≥5 visits in a year and defined multisite use as visits to ≥3 different sites. We estimated predictors of multisite use with multivariate logistic regressions.ResultsAcross all 3 states, 1,033,626 frequent users accounted for 7,613,077 ED visits. Of frequent users, 25% were multisite users, accounting for 30% of the visits studied. Frequent users with at least 1 visit for mental health or substance use-related diagnosis were more likely to use multiple sites. Uninsured frequent users and those with public insurance were associated with less use of multiple EDs than those with private coverage while lacking consistent coverage by the same insurance within each year were associated with using multiple sites.ConclusionsHealth policy interventions to reduce duplicative or unnecessary ED use should apply a population health perspective and engage multiple hospitals. Community-level preventive approaches and a stronger infrastructure for mental health and substance use are essential to mitigate multisite ED use.

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