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 00CJ0
Extirpation of Matter from Trochlear Nrv, Perc Endo Approach
Extirpation of Matter from Trochlear Nerve, Perc Approach
Extirpation of Matter from Trochlear Nerve, Open Approach