W. Va. Code § 33-16F-10

The commissioner may promulgate emergency and legislative rules under the provisions of article three, chapter twenty-nine-a of this code, to prescribe requirements regarding rate making, which may include rules establishing loss ratio standards for the plans; to place limitations on eligibility for coverage under the approved plans; to establish standards to determine whether a plan qualifies as creditable coverage; to determine what medical treatments, procedures and related health services benefits must be included in the plans; and to provide for any other matters deemed necessary to further the intent of this article.