If you provide documentation to your retirement system that you are suspending your FEHB coverage to enroll in a
Medicare Advantage plan, you may reenroll in FEHB if you later lose or cancel your Medicare Advantage plan coverage. However, you must wait until the next Open Season to reenroll in FEHB, unless you involuntarily lose your coverage under the Medicare Advantage plan (including because the plan is discontinued or because you move outside its
service area). In this case, you may reenroll from 31 days before to 60 days after you lose the Medicare Advantage plan coverage, and your reenrollment in FEHB will be effective the day after the Medicare Advantage plan coverage ends (or ended).