; (B) with respect to ground ambulance services not described in subparagraph (A) and for which the transportation originates in a rural area described under paragraph (9) or in a rural census tract described in such paragraph, 3 percent; and (C) with respect to ground ambulance services not described in subparagraph (A) or (B), 2 percent. (18) Increase in mileage rate for ground ambulance services In the case of ground ambulance services furnished on or after January 1, 2018, for purposes of determining the fee schedule amount for such services under this subsection, the payment rate for mileage otherwise applicable to such services shall be increased by— (A) with respect to ground ambulance services for which the transportation originates in a qualified rural area, as identified using the methodology described in paragraph (12)(B)(iii), 3 percent; (B) with respect to ground ambulance services not described in subparagraph (A) and for which the transportation originates in a rural area described under paragraph (9) or in a rural census tract described in such paragraph, 3 percent