Mo. Rev. Stat. § 376.882: Cancellation of policy, refund required — notification.

1. If a Medicare supplement policy issued, delivered, or renewed in this state on or after January 1, 2011, is cancelled for any reason, the insurer shall refund the unearned portion of any premium paid beyond the month in which the cancellation is effective. Any refund shall be returned to the policyholder within twenty days from the date the insurer receives notice of the cancellation.

2. The policyholder may notify the insurer of cancellation of such Medicare supplement policy by sending written or electronic notification.