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 0NC40
Extirpate of Matter from L Parietal Bone, Perc Endo Approach
Extirpation of Matter from Left Parietal Bone, Perc Approach
Extirpation of Matter from Left Parietal Bone, Open Approach