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 00C20
Extirpation of Matter from Dura Mater, Perc Endo Approach
Extirpation of Matter from Dura Mater, Percutaneous Approach
Extirpation of Matter from Dura Mater, Open Approach