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 0GW0X
Revision of Drain Dev in Pituitary Gland, Extern Approach
Revision of Drain Dev in Pituitary Gland, Perc Approach
Revision of Drain Dev in Pituitary Gland, Open Approach
Revision of Drain Dev in Pituitary Gland, Perc Endo Approach