; in cases under paragraph (3) . (c) Increased administrative matching percentage For each calendar quarter during the period beginning on October 1, 2017, and ending on December 31, 2019, the Federal matching percentage otherwise applicable under section 1903(a) of the Social Security Act ( 42 U.S.C. 1396b(a) ) with respect to State expenditures during such quarter that are attributable to meeting the requirement of section 1902(e)(14) (relating to determinations of eligibility using modified adjusted gross income) of such Act shall be increased by 5 percentage points with respect to State expenditures attributable to activities carried out by the State (and approved by the Secretary) to increase the frequency of eligibility redeterminations required by subparagraph (K) of such section (relating to eligibility redeterminations made on a 6-month basis) (as added by subsection (a)). C Per Capita Allotment for Medical Assistance 121. Per capita allotment for medical assistance Title XIX of the Social Security Act is amended— (1) in section 1903 ( 42 U.S.C. 1396b )— (A) in subsection (a), in the matter before paragraph (1), by inserting and section 1903A(a) after except as otherwise provided in this section ; and (B) in subsection (d)(1), by striking to which and inserting to which, subject to section 1903A(a),