Here is the entire code.
http://www.statutes.legis.state.tx.us/Docs/HS/htm/HS.166.htm
Please note this section that applies here. . .
SUBCHAPTER D. MEDICAL POWER OF ATTORNEY
Sec. 166.151. DEFINITIONS. 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,. . .
(1) according to the agent's knowledge of the principal's wishes, including the principal's religious and moral beliefs; or
(2) if the agent does not know the principal's wishes, according to the agent's assessment of the principal's best interests.
(f) Notwithstanding any other provision of this subchapter, an agent may not consent to:
(1) voluntary inpatient mental health services;
(2) convulsive treatment;
(3) psychosurgery;
(4) abortion; or
(5) neglect of the principal through the omission of care primarily intended to provide for the comfort of the principal.
ETA. .sorry. . I meant "principal" and not "primary." No where does it address "patient."