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 0NQCX
Repair Sphenoid Bone, Open Approach
Repair Sphenoid Bone, Percutaneous Approach
Repair Sphenoid Bone, External Approach
Repair Sphenoid Bone, Percutaneous Endoscopic Approach