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 00F6X
Fragmentation in Cerebral Ventricle, Open Approach
Fragmentation in Cerebral Ventricle, External Approach
Fragmentation in Cerebral Ventricle, Perc Endo Approach
Fragmentation in Cerebral Ventricle, Percutaneous Approach