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 0NC70
Extirpation of Matter from Occipital Bone, Open Approach
Extirpation of Matter from Occipital Bone, Perc Approach
Extirpate of Matter from Occipital Bone, Perc Endo Approach