Yes, in your medical power of attorney and the advance directive within the document you can specific that all health care practioners are to be excluded from treatment of you who will not honor the stated terms of your advance directive.To further safeguard your wishes, make sure the person or persons who hold your power of attorney as to your assets and health care fully understand your wishes and are in a position of trust honor such. You should also have a face to face meeting with your treating physician about your wishes and desires as specifically stated in your health care directive and have an understanding that he or she will adhere to your wishes.