5 CFR § 894.203
If I have a self plus one enrollment, when may I change which family member I want to cover or change to self only?
November 4, 2020
You may change your covered family member under a self plus one enrollment or change to self only coverage in the following situations:
(a) During the annual open season;
(b) If your covered family member dies during the year; or
(c) If your covered family member loses eligibility during the year.