If you are an employee eligible for FEHB coverage, you may enroll or change your enrollment from Self Only to Self nd Family, from one plan or option to another, or make any combination of these changes when you or an eligible family member lose coverage under FEHB or any other group health benefits plan (including another Federally-sponsored health benefits program or Medicaid). You must enroll or change your enrollment within the period beginning 31 days before and ending 60 days after the loss of coverage. You can also change your premium conversion status if the enrollment change is on account of and consistent with a qualifying life event.
If you and all your eligible family members gain other coverage under FEHB or another group insurance plan, you may cancel your FEHB. You may change to Self Only if a family member gains other coverage and this causes you to be the only person covered under your Self and Family enrollment. Once the other coverage is gained, you have 60 days to make your change.
As an annuitant, you do not participate in premium conversion. Therefore, you may change your enrollment from Self and Family to Self Only at any time.
Please Note: When you cancel your FEHB enrollment as an annuitant, you will never be able to reenroll unless you had suspended it to enroll in a Medicare Advantage plan, TRICARE, TRICARE for Life, CHAMPVA, health insurance coverage obtained as a Peace Corps volunteer, or Medicaid, for which you had furnished proof of eligibility.
You can find more information in the FEHB Handbook.