; (B) cannot demonstrate (through presentation of certifications described in section 2704(e) or in such other manner as may be specified in regulations, such as a return or statement made under section 6055(d) or 36C of the Internal Revenue Code of 1986), during the look-back period that is with respect to such enforcement period, there was not a period of at least 63 continuous days during which the individual did not have creditable coverage (as defined in paragraph (1) of section 2704(c) and credited in accordance with paragraphs (2) and (3) of such section); and (C) in the case of an individual who had been enrolled under dependent coverage under a group health plan or health insurance coverage by reason of section 2714 and such dependent coverage of such individual ceased because of the age of such individual, is not enrolling during the first open enrollment period following the date on which such coverage so ceased. (2) Look-back period The term look-back period means, with respect to an enforcement period applicable to an enrollment of an individual for a plan year beginning with plan year 2019 (or, in the case of an enrollment of an individual during a special enrollment period, beginning with plan year 2018) in health insurance coverage described in subsection (a)(1), the 12-month period ending on the date the individual enrolls in such coverage for such plan year. (3) Enforcement period The term enforcement period means— (A) with respect to enrollments during a special enrollment period for plan year 2018, the period beginning with the first month that is during such plan year and that begins subsequent to such date of enrollment, and ending with the last month of such plan year