That is not what this means. If your organs are shutting down, the doctor would not use extreme measures to keep you alive. I had a patient once who had been through numerous codes. She did not want to be coded anymore. She was in pain and was tired of being brought back time and again. She asked me what to do. I was only a student nurse at the time. I suggested a family member might be of assistance. She had them call her sister to come in. I think she got her "Do Not Resuscitate" order after that.
From the AMA:
Even if the patient is not terminally ill or permanently unconscious, it is not unethical to discontinue all means of life-sustaining medical treatment in accordance with a proper substituted judgment or best interests analysis. (I, III, IV, V)