1. Short title This Act may be cited as the Assessing Barriers to Opioid Use Disorder Treatment Act . 2. GAO study and report on State options related to the distribution of substance use disorder treatment medications under the medicaid program (a) Study (1) In general The Comptroller General of the United States (in this section referred to as the Comptroller General ) shall conduct a study regarding the barriers to providing medication used in the treatment of substance use disorders under Medicaid distribution models such as the buy-and-bill model, and options for State Medicaid programs to remove or reduce such barriers. The study shall include analyses of each of the following models of distribution of substance use disorder treatment medications, particularly buprenorphine, naltrexone, and buprenorphine-naloxone combinations: (A) The purchasing, storage, and administration of substance use disorder treatment medications by providers. (B) The dispensing of substance use disorder treatment medications by pharmacists. (C) The ordering, prescribing, and obtaining substance use disorder treatment medications on demand from specialty pharmacies by providers. (2) Requirements For each model of distribution specified in paragraph (1), the Comptroller General shall evaluate how each model presents barriers or could be used by selected State Medicaid programs to reduce the barriers related to the provision of substance use disorder treatment by examining what is known about the effects of the model of distribution on— (A) Medicaid beneficiaries’ access to substance use disorder treatment medications; (B) the differential cost to the program between each distribution model for medication assisted treatment