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 0NQ7X
Repair Occipital Bone, Open Approach
Repair Occipital Bone, Percutaneous Approach
Repair Occipital Bone, External Approach
Repair Occipital Bone, Percutaneous Endoscopic Approach