Dura Repair

I am stuck on what cpt code to use for this operative report! This is a co-surgery and I am coding for the second surgeon. The patient had a left ethmoid lesion, the first surgeon went in and removed the lesion. The second surgeon then entered the field and did a transnasal endoscopic resection and repair of the dura. I am not sure what code to use for transnasal endoscopic resection and repair of dura.