; and (5) the program prioritizes pregnant and postpartum women who are uninsured or enrolled in the State Medicaid plan under title XIX of the Social Security Act ( 42 U.S.C. 1396 et seq.), or a waiver of such plan. (c) Grants (1) Limitation The Secretary may award a grant under this section to up to 10 States. (2) Period Grants under this section shall be for a 5-year period. (3) Prioritization In awarding grants under this section, the Secretary shall give priority to the States with the greatest racial disparities in maternal mortality and severe morbidity rates. (d) Report on grant impact and dissemination of best practices Not later than 1 year after all the grant periods awarded under this section have ended, the Secretary shall— (1) submit a report to Congress that describes— (A) the impact of the grants awarded under this section on maternal and child health; (B) best practices and models of care used by recipients of grants under this section; and (C) obstacles faced by recipients of grants under this section in delivering care, improving maternal and child health, and reducing racial disparities in rates of maternal and infant mortality and morbidity