Md. Code, Ins. § 27-217

(a) This section does not apply to: (1) life insurance; (2) health insurance; (3) annuity contracts; or (4) a pooling arrangement by athletic clubs, charitable organizations, community associations, homeowners’ associations, and public entities under Title 19, Subtitle 6 of this article to purchase insurance under this section. (b) An authorized insurer or unauthorized insurer may not make available to a firm, corporation, or association of individuals through a rating plan or form, property insurance, casualty insurance, or surety insurance at a preferred rate or premium based on a fictitious group of the firm, corporation, or association of individuals. (c) A form or plan of insurance that covers a group or combination of persons or risks may not be written or delivered in or outside the State to cover persons or risks in the State at a preferred rate or on a form other than the rate or form offered to the public generally, including persons not in the group or combination, unless the form, plan of insurance, and rates or premiums to be charged have been submitted to and approved by the Commissioner as: (1) not unfairly discriminatory; and (2) not otherwise in conflict with subsection (b) of this section or, to the extent applicable, Title 11, Subtitle 2 of this article. (d) The Commissioner shall adopt regulations to carry out subsection (c) of this section as it applies to property insurance or casualty insurance on motor vehicles.