Evaluation of a Health Information Exchange for Linkage to Mental Health Care After an Emergency Department Visit

Aligning with Washington State’s goal of reducing unnecessary emergency department (ED) use and improving linkage to outpatient primary and behavioral health care, this study evaluated whether an Emergency Department Information Exchange (EDIE) improved linkage to care for Medicaid enrollees with mental health conditions. Follow-up with any physician at 30 days increased slightly, although mental health–specific follow-up declined over time. Difference-in-differences estimates revealed no effect of EDIE on linkage to care after an ED visit. Medicaid beneficiaries with mental health needs and high utilization of the ED likely require additional support to increase timely and appropriate follow-up care.