Part of communication in medicine involves informed consent for treatment and procedures. This is considered a basic patient right. Informed consent involves the patient's understanding of the following:
Patients that are judged incompetent (often determined by two independent physicians or in some instances, by a legal decree) can have others legally permitted to make medical decisions for the patient.
The Right to Healthcare
Right to Refuse Care - Adults, Parents, and Children
Legal Principles in Medicine
Medical Research and Patients' Rights