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 in your lifetime after becoming eligible for Medicare.  This does not mean that you have to enroll in Medicare, your eligibility for Medicare is sufficient.  Since you only get one shot at this option, we strongly suggest you use it wisely..

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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).