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 0NNN0
Release Left Zygomatic Bone, Perc Endo Approach
Release Left Zygomatic Bone, Percutaneous Approach
Release Left Zygomatic Bone, Open Approach