The Body Part Trochlear Nerve is identified by letter "J" and occupies the 4th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to 00NJ
Release Trochlear Nerve, Open Approach
Release Trochlear Nerve, Percutaneous Endoscopic Approach
Release Trochlear Nerve, Percutaneous Approach