Maryland Code, Insurance § 15-104

(b) In accordance with regulations that the Commissioner adopts, the Commissioner shall allow health insurance policies and policies of nonprofit health service plans to contain nonduplication provisions or provisions to coordinate coverage with:

(c) Notwithstanding subsection (b) of this section or any other provision of this article, an individual, group, or blanket health insurance policy, nonprofit health insurance policy, or nonprofit health service plan may not contain a nonduplication provision or provision to coordinate coverage with an individually underwritten and issued, guaranteed renewable, specified disease policy or intensive care policy, that does not provide benefits on an expense-incurred basis.

(d) Health insurance policies and policies of nonprofit health service plans may not contain a provision that requires personal injury protection benefits under a motor vehicle liability insurance policy to be paid before benefits under the policies.