The Approach External is identified by letter "X" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to 0GP1X
Removal of Drainage Device from Pineal Body, Extern Approach
Removal of Drainage Device from Pineal Body, Open Approach
Removal of Drainage Device from Pineal Body, Perc Approach
Removal of Drain Dev from Pineal Body, Perc Endo Approach