5 CFR §890.1606

1. (a)Except as otherwise provided in this subpart, a Postal Service employee may enroll or change enrollment, as provided by § 890.301, in a PSHB plan and may not enroll in a FEHB plan as a Postal Service employee.
2. (b)Except as otherwise provided in this subpart, a Postal Service annuitant may change enrollment or reenroll as provided by § 890.306, in a PSHB plan and may not enroll or reenroll in a FEHB plan as a Postal Service annuitant.
3. (c)Except as otherwise provided in this subpart, reinstatement of enrollment in accordance with § 890.305 is permitted in a PSHB plan.
4. (d)Initial decisions and reconsiderations of PSHB eligibility or enrollment will be made pursuant to § 890.1607.
5. (e)Under this subpart, an enrollment, change of enrollment, or reenrollment made during Open Season takes effect on January 1 of the next year.
6. (f)Under this subpart, OPM will effectuate the following health benefits actions: to enroll or change enrollment; to elect not to enroll; and to reenroll. The employing office makes determinations of eligibility under 5 U.S.C. chapter 89, pursuant to application of 39 U.S.C. 1005.