This bill amends the "Benefit Determination and Utilization Review Act" to include new provisions regarding utilization review decisions. It prohibits retrospective denial of coverage for health care services that were previously approved by the insurer, unless the approval was based on fraudulent or inaccurate information. The bill also prohibits insurers from requiring or conducting a review for certain prescription medicines used in the treatment of alcohol or opioid use disorder, or for the mitigation of opioid withdrawal symptoms. These provisions apply to health benefit plans issued or renewed on or after the effective date of the bill. The bill also requires Medicaid managed care organizations to use medical necessity criteria selected by the Rhode Island division of insurance for conducting utilization reviews for Medicaid benefits. The bill takes effect upon passage.