Maryland Insurance Section 15-502
§ 15-502.
  (a)   This section applies to each individual or group policy or certificate of health insurance or automobile insurance that is:
    (1)   delivered or issued for delivery in the State by an insurer or nonprofit health service plan; and
    (2)   issued, renewed, amended, or reissued on or after July 1, 1978.
  (b)   A policy or certificate subject to this section that provides or pays for health care benefits may not contain a provision that denies or reduces benefits because services are rendered to a policyholder, certificate holder, or beneficiary who is eligible for or receives medical assistance under § 15-103 of the Health - General Article.