When you have a procedure that can cover two close but distinctly different areas such as a facial and a dental nerve block, you need to make sure that your claim encompasses exactly the procedure that was done or you may wind up with a denial of your claim. A common situation would be if the ED physician performed a diagnostic nerve block on a patient complaining of pain in the floor of her mouth and her bottom set of teeth. You would want to be certain that you chose 64402 (Injection, anesthetic agent; facial nerve) for facial nerve blocks, not blocks in the mouth or jaw. The determining factor …