Idaho Code § 41-1333
If an insured person, insured person's estate or entity cancels a health insurance policy for any reason, the insurer or other entity regulated pursuant to the provisions of this title shall refund the pro rata portion of the unused collected premium to the beginning of the next monthly billing cycle. As used in this section the term "health insurance policy" shall refer to a contract entered into pursuant to the provisions of this title for which payment or reimbursement is rendered to a claimant or health care provider for the claimant's utilization of health care services which is any service rendered to an individual for diagnosis, relief or treatment of any injury, ailment or bodily condition. As used in this section "unused collected premium" shall mean that portion of any premium collected which is not used, on a pro rata basis to the beginning of the next monthly billing cycle at the time of cancellation, by the insurer or other entity regulated pursuant to this title to insure against loss as there is no risk of loss from the insured individual, or that portion of any collected premium which would have not been collected had the insured paid monthly.
Idaho Code § 41-1333