The Body Part Facial Nerve is identified by letter "M" and occupies the 4th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to 00CM
Extirpation of Matter from Facial Nerve, Open Approach
Extirpation of Matter from Facial Nerve, Perc Approach
Extirpation of Matter from Facial Nerve, Perc Endo Approach