I already enrolled and picked a plan, but I want my coverage to start sooner. What can I do?

In general, you must choose a plan by the 15th of the month, and pay your bill (your premium) at least four business days before the end of the month, if you want your coverage to start on the first day of the next month. For example, if you want coverage to start on March 1, you must enroll and choose a plan by Feb. 15 and pay your first bill by Feb. 25. For coverage to start on April 1, you must choose a plan by March 15 and pay your first bill by March 26.