HB 4585

Amends the Illinois Insurance Code. Provides that coverage for treatment in a residential treatment center shall include residential coverage for the diagnosis and treatment of substance use disorders. Provides that this coverage shall include unlimited medically necessary treatment for substance use disorder treatment services provided in residential settings. Prohibits the coverage from applying financial requirements or treatment limitations to residential substance use disorder benefits that are more restrictive than the predominant financial requirements and treatment limitations applied to other medical and surgical benefits covered by the policy. Sets forth provisions concerning cost sharing; application of coverage requirements; prior authorization; clinical review; discharge plans; other forms of utilization review; and the criteria for medical necessity determinations.