Sec. 1905. [42 U.S.C. 1396d] For purposes of this title—
(a) The term “medical assistance” means payment of part or all of the cost of the following care and services or the care and services themselves, or both[90] (if provided in or after the third month before the month in which the recipient makes application for assistance or, in the case of medicare cost-sharing with respect to a qualified medicare beneficiary described in subsection (p)(1), if provided after the month in which the individual becomes such a beneficiary) for individuals, and, with respect to physicians' or dentists' services, at the option of the State, to individuals (other than individuals with respect to whom there is being paid, or who are eligible, or would be eligible if they were not in a medical institution, to have paid with respect to them a State supplementary payment and are eligible for medical assistance equal in amount, duration, and scope to the medical assistance made available to individuals described in section 1902(a)(10)(A)) not receiving aid or assistance under any plan of the State approved under title I, X, XIV, or XVI, or part A of title IV, and with respect to whom supplemental security income benefits are not being paid under title XVI, who are—
(i) under the age of 21, or, at the option of the State, under the age of 20, 19, or 18 as the State may choose,
(ii) relatives specified in section 406(b)(1) with whom a child is living if such child is (or would, if needy, be) a dependent child under part A of title IV,
(iii) 65 years of age or older,
(iv) blind, with respect to States eligible to participate in the State plan program established under title XVI, or
(v) 18 years of age or older and permanently and totally disabled, with respect to States eligible to participate in the State plan program established under title XVI,
(vi) persons essential (as described in the second sentence of this subsection) to individuals receiving aid or assistance under State plans approved under title I, X, XIV, or XVI,
(vii) blind or disabled as defined in section 1614, with respect to States not eligible to participate in the State plan program established under title XVI,
(viii) pregnant women,...