A living will or appointment of health care representative becomes operative when (1) the document is furnished to the attending physician or advanced practice registered nurse, and (2) the declarant is determined by the attending physician or advanced practice registered nurse to be incapacitated. At any time after the appointment of a health care representative, the attending physician or advanced practice registered nurse shall disclose such determination of incapacity, in writing, upon the request of the person named as the health care representative.