22 U.S.C. § 2740

1. (a)The Secretary and Administrator are authorized to offer employees the option of extending Federal Employee Health Benefit coverage during pre-approved leave without pay for up to 3 years.
2. (b)If an employee elects to continue coverage pursuant to subsection (a) for longer than 365 days, the employee shall be responsible for 100 percent of the premium (employee share and government share) during such longer period.