1. Short title This Act may be cited as the Helping Adults Protect Immunity Act or the HAPI Act . 2. Improving access to adult vaccines under Medicaid (a) Requiring medicaid plans To cover adult vaccinations Section 1902(a)(10)(A) of the Social Security Act ( 42 U.S.C. 1396a(a)(10)(A) ) is amended in the matter preceding clause (i) by inserting (13)(B), after (5), . (b) No cost-Sharing for vaccinations (1) General cost-sharing limitations Section 1916 of the Social Security Act ( 42 U.S.C. 1396o ) is amended— (A) in subsection (a)(2)— (i) in subparagraph (F), by striking , or and inserting a comma; (ii) in subparagraph (G), by striking ; and and inserting , or ; and (iii) by adding at the end the following new subparagraph: (H) vaccines described in section 1905(a)(13)(B) (and the administration of such vaccines); and ; and (B) in subsection (b)(2)— (i) in subparagraph (F), by striking , or and inserting a comma; (ii) in subparagraph (G), by striking ; and and inserting , or ; and (iii) by adding at the end the following new subparagraph: (H) vaccines described in section 1905(a)(13)(B) (and the administration of such vaccines); and . (2) Application to alternative cost-sharing Section 1916A(b)(3)(B) of the Social Security Act ( 42 U.S.C. 1396o–1(b)(3)(B) ) is amended by adding at the end the following new clause: (xii) Vaccines described in section 1905(a)(13)(B) (and the administration of such vaccines). . (c) Enhanced FMAP for adult vaccines Section 1905(b) of the Social Security Act ( 42 U.S.C. 1396d(b) ) is amended— (1) by striking and (5) and inserting (5) ; (2) by striking services and vaccines described in subparagraphs (A) and (B) of subsection (a)(13), and prohibits cost-sharing for such services and vaccines and inserting services described in subsection (a)(13)(A), and prohibits cost-sharing for such services ; (3) by striking medical assistance for such services and vaccines and inserting medical assistance for such services