Maryland Code, Insurance § 15-1A-08

(a) A carrier that offers a health benefit plan, including a grandfathered plan, that provides for dependent coverage of a child shall continue to make the coverage available for the child until the child is 26 years old.

(b) A carrier may not establish rules for eligibility, including continued eligibility, for coverage of a child under the age of 26 years based on any factor other than the relationship between the child and the insured.