CMS has published a proposed rule that would apply provisions of the Mental Health Parity and Addiction Equity Act of 2008 (MHPAEA) to Medicaid beneficiaries who receive services through managed care organizations or alternative benefit plans and to the Children’s Health Insurance Program (CHIP). In general, such programs will be required to meet the mental health and substance use disorder benefits parity requirements regarding financial and quantitative and nonquantitative treatment limitations consistent with regulation applicable to private insurers. CMS also proposes to require such plans to make available upon request to beneficiaries and contracting providers the criteria for medical necessity determinations with respect to mental health and substance use disorder benefits. The proposed rule also would require the state to make available to the enrollee the reason for any denial of reimbursement or payment for services with respect to mental health and substance use disorder benefits. The proposed rule was published on April 10, 2015, and comments are due by June 9, 2015.