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 0NQ3X
Repair Right Parietal Bone, Percutaneous Endoscopic Approach
Repair Right Parietal Bone, External Approach
Repair Right Parietal Bone, Percutaneous Approach
Repair Right Parietal Bone, Open Approach