Insurance: health insurers; prior authorization for certain opioid use disorder and alcohol use disorder medications; prohibit. Amends 1956 PA 218 (MCL 500.100 - 500.8302) by adding sec. 3406ww.

SB 400 prohibits Michigan health insurers from requiring prior authorization for medications treating opioid use disorder or alcohol use disorder. This directly affects health insurance companies and patients seeking these specific treatments, removing a common administrative barrier. The bill amends Michigan’s Insurance Code to explicitly ban prior authorization requirements for these medications, using the existing definition of "prior authorization" from Section 2212e. The law ensures faster access to evidence-based treatment without insurer delays.