All policies insuring the legal liability of the insured, issued in this state by any company, association or reciprocal exchange shall, notwithstanding any other provision of the statutes, contain a provision providing that, in event an execution on a judgment against the insured be returned unsatisfied in an action by a person who is injured or whose property is damaged, the judgment creditor shall have a right of action against the insurer to the same extent that such insured could have enforced the insured's claim against such insurer had such insured paid such judgment.
Iowa Code § 516.1