The Body Part Cranial Cavity is identified by number "1" and occupies the 4th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to 0WJ1
Inspection of Cranial Cavity, Percutaneous Approach
Inspection of Cranial Cavity, Open Approach
Inspection of Cranial Cavity, Perc Endo Approach