; and (2) by inserting , or reduced cost-sharing provided under section 1899D before the period at the end. 5. Improving Medicare beneficiary enrollment procedures and effective dates of coverage (a) General enrollment period Section 1837(e) of the Social Security Act ( 42 U.S.C. 1395p(e) ) is amended to read as follows: (e) General and special enrollment periods (1) General enrollment (A) For coverage during years before 2020 There shall be a general enrollment period during the period beginning on January 1 and ending on March 31 of each year before 2020. (B) For coverage during years beginning with 2020 Subject to subparagraph (B), there shall be a general enrollment period beginning on October 15 and ending on December 31 of 2019 and each subsequent year. (2) Special enrollment Beginning January 1, 2020, the Secretary shall establish special enrollment periods in the case of individual who meets such exceptional conditions as the Secretary may provide. . (b) Effective dates of coverage (1) In general Section 1838(a) of the Social Security Act ( 42 U.S.C. 1395q(a) ) is amended— (A) by amending paragraph (2) to read as follows: (2) (A) in the case of an individual who enrolls pursuant to subsection (d) of section 1837 before the month in which he first satisfies paragraph (1) or (2) of section 1836, the first day of such month; or (B) in the case of an individual not described in subparagraph (A) who first satisfies such paragraph in a month beginning before January 1, 2020 and who enrolls— (i) pursuant to such subsection (d) in such month in which he first satisfies such paragraph, the first day of the month following the month in which he so enrolls; 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