; and (2) by amending paragraph (3) to read as follows: (3) (A) in the case of an individual who is deemed to have enrolled on or before the last day of the third month of his initial enrollment period beginning before January 1, 2019, the first day of the month in which he first meets the applicable requirements of section 1836 or July 1, 1973, whichever is later, or (B) in the case of an individual who is deemed to have enrolled on or after the first day of the fourth month of his initial enrollment period beginning before January 1, 2019, as prescribed under subparagraphs (B)(i), (B)(ii), (B)(iii), and (C) of paragraph (2) of this subsection. . (b) General and special enrollment periods Section 1837(e) of the Social Security Act ( 42 U.S.C. 1395p(e) ) is amended to read as follows: (e) Enrollment Periods (1) For coverage during years before 2019 There shall be a general enrollment period during the period beginning on January 1 and ending on March 31 of each year before 2019. (2) For coverage during years beginning with 2019 For 2019 and each subsequent year: (A) In general Subject to subparagraph (B), there shall be a general enrollment period beginning on October 15 of the previous year through December 31 of such previous year. (B) Exceptional Circumstances The Secretary shall establish special enrollment periods in the case of a potentially eligible Medicare individual (as defined in section 1804(d)(8)) who meets such exceptional conditions as the Secretary may provide. . (c) Technical correction Section 1839(b) of the Social Security Act ( 42 U.S.C. 1395r(b) ) is amended by striking close of the enrollment period each place it appears and inserting close of the month .