Generally, your enrollment may continue for up to 365 days of leave without pay unless you want it to terminate, or do not respond to your employing office's notice about continuing coverage during a period in leave without pay status. You must pay the employee share of premiums for every pay period your enrollment continues.
If you are currently in a leave without pay or other type of nonpay status, or receiving pay that is insufficient to cover the cost of your FEHB premiums, and have not received a notice from your agency, you should contact your employing office.
If you elect to continue coverage during leave without pay status or insufficient pay, you can choose either to pay the premiums directly or to incur a debt. Your employing office may also offer a pre-pay option.
Your enrollment will terminate at the end of the pay period which includes the 365th day in consecutive leave without pay status. You will have a 31-day extension of coverage and conversion rights.
You can find additional information in the FEHB Handbook.