The overarching goal of this project is to improve timely access to appropriate mental health (MH) care for children and youth. The investigators will conduct and rigorously evaluate implementations of this pathway in four exemplar hospitals and associated CMHA dyads within a local health region. Outcomes-based validation of this pathway is important for effective adoption in other communities. A multiple baseline study design and conduct interrupted time-series analysis will be used to evaluate whether the EDMHCP has resulted in improved health care utilization, medical management, and health sector coordination. To ensure EDMHCP feasibility in various settings, implementation will occur in four exemplar hospital-community dyads with different workflows and patient populations.