US National Spending On Mental Health And Substance Use Disorder Treatment Driven By Case Growth, 2000–21

The analysis highlights a significant rise in national spending on mental health and substance use disorder treatment, which aligns with an increase in reported case numbers over the two-decade period.

The findings, published in the April 2026 issue of Health Affairs, suggest that resource allocation has been reactive to the growing demand for treatment services.

This trend underscores the need for continuous assessment of infrastructure and capacity to ensure that treatment systems can effectively meet the evolving needs of the population.