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 00C90
Extirpation of Matter from Thalamus, Open Approach
Extirpation of Matter from Thalamus, Percutaneous Approach
Extirpation of Matter from Thalamus, Perc Endo Approach