Retirees can utilize Qualifying Life Event (QLE) code "2L" to change FEHB plans or options when they become "medicare eligible."
You may change your FEHB enrollment to any available plan or option at any time beginning 30 days before you become eligible for Medicare. You may use this enrollment change opportunity only once. You may also change your enrollment during the annual Open Season, or because of another event that permits enrollment changes (such as a change in family status).
If your FEHB premium is automatically deducted from your monthly annuity from OPM, you can use OPM Form 2809 to request this change.