WRITTEN DIRECTIVE BY COMPETENT ADULT; NOTICE TO PHYSICIAN.

(a) A competent adult may at any time execute a written directive.

(b) Except as provided by Subsection (b-1), the declarant must sign the directive in the presence of two witnesses who qualify under Section 166.003, at least one of whom must be a witness who qualifies under Section 166.003(2). The witnesses must sign the directive.

(b-1) The declarant, in lieu of signing in the presence of witnesses, may sign the directive and have the signature acknowledged before a notary public.

(c) A declarant may include in a directive directions other than those provided by Section 166.033 and may designate in a directive a person to make a health care or treatment decision for the declarant in the event the declarant becomes incompetent or otherwise mentally or physically incapable of communication.

(d) A declarant shall notify the attending physician of the existence of a written directive. If the declarant is incompetent or otherwise mentally or physically incapable of communication, another person may notify the attending physician of the existence of the written directive. The attending physician shall make the directive a part of the declarant's medical record.