Nothing in this subchapter shall be construed to permit the State to reduce medical or other assistance available or to alter eligibility under title V of the Social Security Act [42 U.S.C. 701 et seq.] (relating to maternal and child health) or title XIX of the Social Security Act [42 U.S.C. 1396 et seq.] (relating to medicaid for infants or toddlers with disabilities) within the State.