5 CFR §870.301

1. (a)Each nonexcluded employee is automatically insured for Basic insurance unless he/she waives it.
2. (b)
   1. (1)Optional insurance must be specifically elected; it is not automatic.
   2. (2)An employee may elect one or more types of Optional insurance if:
      1. (i)He/she has Basic insurance; and
      2. (ii)He/she does not have a waiver of that type (or types) or Optional insurance still in effect.
3. (c)Notwithstanding any other provision in this part, the hiring of a Federal employee, whether in pay status or nonpay status, for a temporary, intermittent position with the decennial census has no effect on the amount of his/her Basic or Option B insurance, the withholdings or Government contribution for his/her insurance, or the determination of when 12 months in nonpay status ends.