“…Among those in the general population who utilize high cost and urgent medical services, a subset exhibits high frequency utilization. Interestingly, these high utilizers in the general population are more likely to have unmet non-medical needs such as food and housing insecurity, and are more likely to have mental and behavioral health conditions including substance abuse disorders (Behr & Diaz, 2016;Kushel, Perry, Bangsberg, Clark & Moss, 2002;Niedzwiecki, 2018). Mental illness has emerged as a substantial driver of medical service utilization: almost half of the frequent ED utilizers in the general population have a mental health diagnosis (Behr & Diaz, 2016); and 80% of people with mental illness sought medical, rather than behavioral health services, for treatment of their mental illness (Kathol, Melek & Sargent, 2015).…”