Integrated dual diagnosis treatment among United States mental health treatment facilities: 2010 to 2018.

•The proportion of facilities that reported offering any substance use services increased from 50.1% in 2010 to 57.1% in 2018.•Among facilities with substance use services, significantly fewer facilities reported Integrated Dual Diagnosis Treatment in 2018 than in 2010•State facility licensing and state implementation of Integrated Dual Diagnosis Treatment are linked to more common use of this model.