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 00CG0
Extirpation of Matter from Optic Nerve, Open Approach
Extirpation of Matter from Optic Nerve, Perc Approach
Extirpation of Matter from Optic Nerve, Perc Endo Approach