I recently started coding for anes and I need a little clarification in regards to MAC and documentation. When billing MAC do you always need a diagnosis to justify its use? I have many colons/egds done with MAC, (Medicare and other carriers.) Sometimes I get a diagnosis on the anesthesia record that will say diabetes, hypertension, anxiety etc. Many times MAC is used and I only get the diagnosis for the procedure like a PEG tube placement with dyshagia. or I & D of left hand, diagnosis is infection, pt had a P4 status but I have no other diagnosis listed to support the MAC or the P4? I guess I need to know does MAC stand on it's own or do you always need to back up its use? Thanks