Md. Code, Insurance § 15–506

(a) Each insurer and nonprofit health service plan that provides maternity benefits in a policy form customarily issued on an individual or family basis shall offer the benefits to individuals regardless of marital status.

(b) (1) This subsection applies to each group or blanket health insurance policy that is delivered or issued for delivery in the State by an insurer or nonprofit health service plan.

(2) Each policy subject to this subsection that provides maternity benefits for pregnancy and childbirth of employees or members or of covered dependents of employees or members, whether the benefits are in the form of disability, hospital, medical, or surgical benefits, shall provide identical benefits regardless of marital status to:

(i) all covered employees or members; or

(ii) all covered employees or members and all covered dependents of employees or members.