Ind. Code § 27-2-21-17
(a) If:
(2) the insurer receives notice of the determination from the consumer reporting agency or the insured;
the insurer shall re-underwrite and re-rate the insured not more than thirty (30) days after receiving the notice.
(b) After an insurer re-underwrites or re-rates an insured as described in subsection (a), the insurer shall:
(2) if the insurer determines that the insured has overpaid a premium, refund to the insured the amount of overpayment calculated back to the shorter of the:
As added by P.L.201-2003, SEC.1.