..Nationally representative samples of ED visits in the United States were assessed using a repeated cross-sectional analysis of National Hospital Ambulatory Medical Care Survey data.
This study used diagnoses associated with each ED visit to identify changes in proportions in mental health diagnostic categories (psychiatric diagnoses only, substance use–related diagnoses only, or both, based on ICD-9-CM or ICD-10-CM criteria). These trends were further examined by age, sex, race/ethnicity, and insurance status. The statistical significance of temporal patterns was evaluated with multivariate logistic regression analyses.
Results: Between 2007 and 2016, about 8.4 million (8.3%) of 100.9 million ED visits nationwide were for psychiatric or substance use–related diagnoses. Over the 10-year study period, the proportion of ED visits for mental health diagnoses increased from 6.6% to 10.9% (P < .001).
Visits for alcohol and “other” substance use and psychiatric diagnoses classified as “other” accounted for an increasing portion of mental health–related ED visits during this time (P < .001). ED visits in which Medicaid was the primary source of insurance coverage showed the largest increase, nearly doubling from 27.2% in 2007–2008 to 42.8% in 2015–2016 (adjusted odds ratio for linear trends = 1.71; 95% CI, 1.36–2.15).
Conclusions: ED utilization for mental health conditions—and especially substance use conditions—significantly increased in the last decade. The increasing use of EDs by patients with mental health conditions may indicate suboptimal delivery of effective or acceptable outpatient mental health care, particularly for substance use–related conditions.