00cefaae_cial_Enrollment_Periods__SEPs___When_does_my_coverage_begin_
[SEP Event] Errors related to the Exchange/ Marketplace, incorrect or incomplete information provided by an enrollment assister (Navigator, broker or sales agent, insurance company, etc.), or other problems related to your enrollment process Exceptional circumstances (for example if you faced a serious medical condition, natural disaster, or other crisis that kept you from enrolling) [When can I enroll?] Determined by the US Department of Health & Human Services (HHS) [When does my coverage begin?] 
Depending on your situation, coverage may begin on the date of the triggering event. —or— If you enroll within first 15 days of the month, your coverage begins on the first day of the month after you enroll. —or— If you enroll on or after the 16th day of the month, your coverage begins on the first day of the next month after you enroll.
Health First Individual | Special Enrollment Periods (SEPs)
When does my coverage begin?