This subchapter does not limit or impair any legal right or responsibility that any person, including a physician or health or residential care provider, may have to make or implement health care decisions on behalf of a person, 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 § 166.166