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 0NQQX
Repair Left Orbit, Percutaneous Endoscopic Approach
Repair Left Orbit, External Approach
Repair Left Orbit, Percutaneous Approach
Repair Left Orbit, Open Approach