Md. Code, Health - General § 6–203

Notwithstanding any provisions of this title or any other provision of law, if a domestic partner has selected a health care agent in accordance with Title 5, Subtitle 6 of this article, that health care agent retains the authority to make any decisions for the domestic partner that are provided for in the selection of the health care agent until the health care agency has been revoked in accordance with the provisions of Title 5, Subtitle 6 of this article.