(a) Normal Effective Date. The effective date of enrollment, re-enrollment, or change of enrollment shall be the first of the month following the date the employee or annuitant's Health Benefits Plan Enrollment Form is received in the employing office, subject to deferral under subsection (b) of this section. An enrollment shall not become effective if payroll deduction is not accomplished within six months following the date on which such enrollment would normally have become effective.

(b) Deferred Effective Date. The effective date of enrollment of an employee or annuitant who, in the month preceding that in which his or her enrollment would otherwise be effective, has insufficient earnings after all other mandatory deductions to permit deduction of his or her full contributions, shall be the first day of the month following that in which his or her earnings after other mandatory deductions are sufficient to permit such deduction. This applies to an employee hired on the last day of the month which is also the first day of a pay period.

(c) Effective Date of Enrollment of a Newborn Child or Adopted Child of an Employee or Annuitant Enrolled for Self and One or More Family Members. Notwithstanding the effective date of enrollment as otherwise specified in this section, and without requirement of any prior enrolling action, enrollment of a newborn child or adopted child of an employee or annuitant who has enrolled family members shall be effective on the date of birth or the date physical custody is obtained, and any increase in premium because of the addition of such family member shall be effective on the first of the following month.

(d) Effective Date of Enrollment of an Annuitant on Approval of Retirement. The effective date of enrollment of an annuitant under Section 599.502(c)(3) is the first of the month following the month in which retirement is approved, but in no event earlier than the first day of the month following the effective date of retirement.

(e) Effective Date of Enrollment of an Eligible Family Member (other than an adopted or newborn child). The effective date of a change of enrollment adding an eligible family member, other than an adopted or a newborn child, shall be the first of the month following the date the Health Benefits Plan Enrollment Form is received in the employing office. Enrollment of an eligible family member may not be earlier than the first day of the month following the acquisition of the family member.

(f) Contracting Agency Employees and Annuitants. Enrollments of a contracting agency's employees and annuitants which are received in the office of the Board on or before the last day of the month immediately preceding the effective date of the agency's participation under the Act shall be effective on the effective date of such agency participation.

(g) Effective Date of Enrollment of a Newborn Child or Adopted Child of an Employee or Annuitant Enrolled for Self Only. The effective date of enrollment of a newborn or adopted child of an employee or annuitant enrolled for self only shall be the first day of the month following the date of birth or the date physical custody is obtained. Any premium increase resulting from the enrollment of such child shall be due from the effective date of enrollment.

(h) Effective Date in Open Enrollment Period. The effective date of enrollment in special or limited open enrollment period shall be fixed by the Board in its action providing such open enrollment period.