; or (ii) pursuant to such subsection (d) in the month following such month in which he first satisfies such paragraph, the first day of the second month following the month in which he so enrolls; or (iii) pursuant to such subsection (d) more than one month following such month in which he satisfies such paragraph, the first day of the third month following the month in which he so enrolls; or (C) in the case of an individual not described in subparagraph (A) who enrolls pursuant to subsection (e) of section 1837 in a month beginning— (i) before April 1, 2019, the July 1 following the month in which he so enrolls; or (ii) on or after October 1, 2019, the first day of the month following the month in which he so enrolls; or (D) in the case of an individual not described in subparagraph (A) who first satisfies such paragraph in a month beginning on or after January 1, 2020, and who enrolls pursuant to such subsection (d) in such month in which he first satisfies such paragraph or in any subsequent month in the initial enrollment period, the first day of the month following the month in which he so enrolls; or