The Approach Open is identified by number "0" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to 00CK0
Extirpation of Matter from Trigeminal Nerve, Perc Approach
Extirpation of Matter from Trigem Nrv, Perc Endo Approach
Extirpation of Matter from Trigeminal Nerve, Open Approach