Trend of emergency department presentations with a mental health diagnosis in Australia by diagnostic group, 2004-05 to 2016-17.

Between 2004-05 and 2016-17, rates of ED presentations increased across most MH diagnostic groups, but particularly psychoactive substance use-related disorders. To reduce the need for MH crisis care in Australian EDs, strategies are required to reduce psychoactive substance use in the community, and policies may be needed to strengthen the capability of community MH services and primary care professionals to recognise, diagnose and treat earlier in the course of illness.