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 00NH0
Release Oculomotor Nerve, Percutaneous Endoscopic Approach
Release Oculomotor Nerve, Open Approach
Release Oculomotor Nerve, Percutaneous Approach