215 ILCS 5/357.31
In the event of the death of a policyholder of an individual accident and health insurance policy, the insurance company, upon receipt of notice of the policyholder's death and a request for a pro-rata refund, supported by a valid death certificate supplied by a party entitled to claim such refund, shall refund the unearned premium pro-rated to the month of the policyholder's death. In no event shall such refund of premium be computed by the use of a short-rate table. Refund of the premium and termination of the coverage shall be without prejudice to any claim originating prior to the date of the policyholder's death. Coverage of persons insured under the same policy other than the policyholder shall not be affected by the premium refund provided for in this Section nor shall the obligation of such other insureds to pay required premiums be diminished pursuant to this Section.
215 ILCS 5/357.31