The Approach Open is identified by number "0" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to 0GN00
Release Pituitary Gland, Percutaneous Approach
Release Pituitary Gland, Percutaneous Endoscopic Approach
Release Pituitary Gland, Open Approach