215 ILCS 110/32.1

All claims payable in the form of indemnities under the terms of a service plan contract or subscription certificate shall be paid within 30 days following receipt by the corporation of due proof of loss. A dental service plan corporation which neglects to pay a claim within 30 days following receipt by the corporation of due proof of loss shall pay the subscriber interest at the rate of 9% per annum from the 30th day after receipt of such proof of loss to the date of late payment.