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 0NNF0
Release Right Ethmoid Bone, Open Approach
Release Right Ethmoid Bone, Percutaneous Endoscopic Approach
Release Right Ethmoid Bone, Percutaneous Approach