Code of Federal Regulations Title 5. Administrative Personnel § 5.870.502 Basic insurance:  Waiver/cancellation of insurance

(a) An insured individual may cancel his/her Basic insurance at any time by filing a waiver of Basic insurance coverage. An employee files with the employing office. An annuitant files with OPM or other office that administers his/her retirement system. If still employed, a compensationer files with the employing office, and if not still employed, with OPM. The waiver is effective, and the insurance stops, at the end of the pay period in which the waiver is properly filed. Exception:  an individual who has assigned his/her insurance under subpart I of this part cannot cancel the insurance.

(b) An individual who cancels his/her Basic insurance automatically cancels all forms of Optional insurance.