RN Charting Another RN's MD Discussion

When discussing an acute care patient for a skilled nursing unit vs a rehab unit, an RN on the rehab unit talks with the rehab medical director to get their approval or denial to accept the patient to the rehab unit. The rehab RN does not document in the acute care patient chart what decision has been made (to accept or deny the patient). This rehab RN calls the admission coordinator to tell them and they are suppose to document the findings in the patient's acute care chart. IS THIS LEGALLY ACCEPTABLE. At times there are multiple patients being discussed, what if the wrong patient is accepted. The admission coordinator has not proof that the rehab RN did or did not tell them the correct patient! Can anyone give me a legal standpoint on this?