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 00F3X
Fragmentation in Cran Epidur Spc, Perc Endo Approach
Fragmentation in Intracranial Epidural Space, Open Approach
Fragmentation in Intracranial Epidural Space, Perc Approach
Fragmentation in Cran Epidur Spc, Extern Approach