; and (4) guidance and technical assistance to State Medicaid agencies regarding additional flexibilities and incentives related to screening, prevention, and post-discharge services, including parenting supports, under contracts with Medicaid managed care organizations. (d) GAO study Not later than one year after the date of the enactment of this Act, the Comptroller General of the United States shall conduct a study, and submit to Congress a report, addressing gaps in coverage for pregnant women with substance use disorder under the Medicaid program under title XIX of the Social Security Act, and gaps in coverage for postpartum women with substance use disorder who had coverage during their pregnancy under the Medicaid program under such title.