; and (II) the number of the units of such dosage and strength of the drug dispensed during the rebate period to rebate eligible individuals enrolled in the prescription drug plans administered by the PDP sponsor or the MA–PD plans administered by the MA organization; divided by (ii) the total number of units of such dosage and strength of the drug dispensed during the rebate period to rebate eligible individuals enrolled in all prescription drug plans administered by PDP sponsors and all MA–PD plans administered by MA organizations. (D) Use of estimates The Secretary may establish a methodology for estimating the average Medicare drug program rebate eligible rebate amounts for each rebate period based on bid and utilization information under this part and may use these estimates as the basis for determining the rebates under this section. If the Secretary elects to estimate the average Medicare drug program rebate eligible rebate amounts, the Secretary shall establish a reconciliation process for adjusting manufacturer rebate payments not later than 3 months after the date that manufacturers receive the information collected under section 1860D–12(b)(7)(B). (4) Length of agreement The provisions of paragraph (4) of section 1927(b) (other than clauses (iv) and (v) of subparagraph (B)) shall apply to rebate agreements under this subsection in the same manner as such paragraph applies to a rebate agreement under such section. (5) Other terms and conditions The Secretary shall establish other terms and conditions of the rebate agreement under this subsection, including terms and conditions related to compliance, that are consistent with this subsection. (6) Definitions In this subsection and section 1860D–12(b)(7): (A) Rebate eligible individual The term rebate eligible individual means— (i) a subsidy eligible individual (as defined in section 1860D–14(a)(3)(A)); (ii) a Medicaid beneficiary treated as a subsidy eligible individual under clause (v) of section 1860D–14(a)(3)(B)