You may change your participation status in premium conversion during the annual FEHB open enrollment period, or during the calendar year if you have a qualifying life event. Qualifying life events include marriage, birth of a child, or change in a spouse's employment.
Enrollment or participation in premium conversion ends if you terminate or are terminated from Federal government employment. If you are eligible and elect to participate in Temporary Continuation of Coverage (TCC), you pay those premiums directly on an after-tax basis.
For detailed information including pros/cons see the

