Iowa Code § 509.13: Rules.

The commissioner of insurance shall issue rules establishing minimum standards for group Medicare supplement policies and minimum standards for benefits under coverages contained in group Medicare supplement policies. These rules shall be consistent with those rules established for individual Medicare supplement policies pursuant to chapter 514D. The commissioner also shall establish by rule reasonable and creditable anticipated minimum loss ratios for group Medicare supplement policies. Rules issued by the commissioner shall give issuers of group Medicare supplement policies a reasonable time to achieve compliance.