Montana Title 50. Health and Safety § 50-16-521. Health care representatives

(1) A person authorized to consent to health care for another may exercise the rights of that person under this part to the extent necessary to effectuate the terms or purposes of the grant of authority. If the patient is a minor and is authorized under 41-1-402 to consent to health care without parental consent, only the minor may exclusively exercise the rights of a patient under this part as to information pertaining to health care to which the minor lawfully consented.

(2) A person authorized to act for a patient shall act in good faith to represent the best interests of the patient.