In this subchapter:
(1) "Adult" means a person 18 years of age or older or a person under 18 years of age who has had the disabilities of minority removed.
(2) "Agent" means an adult to whom authority to make health care decisions is delegated under a medical power of attorney.
(3) "Health care provider" means an individual or facility licensed, certified, or otherwise authorized to administer health care, for profit or otherwise, in the ordinary course of business or professional practice and includes a physician.
(4) "Principal" means an adult who has executed a medical power of attorney.
(5) "Residential care provider" means an individual or facility licensed, certified, or otherwise authorized to operate, for profit or otherwise, a residential care home.