conditions described in the preceding sentence receives health home services under this section through a fee-for-service or managed care system. Such payments for such services shall be treated as medical assistance (as defined in section 1905(a)) for purposes of payments made under section 1903(a), except that, during the first 8 fiscal year quarters that the State plan amendment is in effect, the Federal medical assistance percentage applicable to such payments shall be increased by 20 percentage points, but in no case shall exceed 90 percent. (2) Methodology (A) In general The State shall specify in the State plan amendment the methodology the State will use for determining payment under paragraph (1). Such methodology for determining payment— (i) may be tiered to reflect, with respect to each child with medically complex conditions and each designated provider, or team of health care professionals, the severity or number of such child’s chronic conditions, life-threatening illnesses, disabilities, or rare diseases or the specific capabilities of such provider or such team