This subchapter does not impair or supersede any legal right or responsibility a person may have to effect the withholding or withdrawal of life-sustaining treatment in a lawful manner, provided that if an attending physician or health care facility is unwilling to honor a patient's advance directive or a treatment decision to provide life-sustaining treatment, life-sustaining treatment is required to be provided the patient, but only until a reasonable opportunity has been afforded for transfer of the patient to another physician or health care facility willing to comply with the advance directive or treatment decision.
Tex. Health and Safety Code § 166.051