In general
Subject to clause (ii) and subparagraph (D)—
(I)#
in the case of an MA eligible individual who is enrolled in an MA plan, at any time during the first 3 months of a year (beginning with 2019); or
(II)#
in the case of an individual who first becomes an MA eligible individual during a year (beginning with 2019) and enrolls in an MA plan, during the first 3 months during such year in which the individual is an MA eligible individual;