in the case of an LI NET eligible individual who is a full-benefit dual eligible individual (as defined in section 1396u–5(c)(6) of this title ) or a recipient of supplemental security income benefits under subchapter XVI, retroactive coverage (in the form of reimbursement of the amounts that would have been paid under this part had such individual been enrolled in a prescription drug plan or MA–PD plan) of covered part D drugs purchased by such individual during the period that begins on the date that is the later of—
(i)#
the date that such individual was first eligible for a low-income subsidy under this part; or
(ii)#
the date that is 36 months prior to the date such individual enrolls in a prescription drug plan or MA–PD plan,
and ends on the date that coverage under such plan takes effect.