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 0NQ6X
Repair Left Temporal Bone, Open Approach
Repair Left Temporal Bone, Percutaneous Approach
Repair Left Temporal Bone, External Approach
Repair Left Temporal Bone, Percutaneous Endoscopic Approach