Maryland Code, Insurance § 15-1A-22

(b) This section does not prohibit a carrier from refusing, withholding, or denying coverage under a health benefit plan to any individual for failure to conform to the usual and regular requirements, standards, and regulations of the carrier, unless the denial is based on discrimination on the grounds of race, sex, color, creed, national origin, marital status, sexual orientation, age, gender identity, or disability.

(c) This section does not apply to limitations or restrictions related to age or marital status that are specifically authorized or required under this article to limit or restrict eligibility for insurance coverage or benefits.

(d) A carrier may not refuse, withhold, or deny any individual coverage under a health benefit plan offered by the carrier or otherwise discriminate against any individual because of the individual's race, sex, creed, color, national origin, marital status, sexual orientation, age, gender identity, or disability.

(e) The Commission on Civil Rights shall enforce the provisions of this section as provided for in § 2-202 of this article.