If you have been enrolled in the FEHB Program from your first opportunity to enroll or for the full five years of service immediately preceding retirement, you may carry your FEHB coverage into retirement (provided you retire on an immediate annuity in a qualifying retirement system.). See the FEHB handbook for more information.
If you have TRICARE, your period of coverage under TRICARE counts toward meeting this requirement. However, you must be enrolled in an FEHB health plan on the date of retirement to continue coverage. Once you retire, you can request to suspend the FEHB enrollment as a retiree.
See the FEHB handbook for more information.