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 01D20
Extraction of Phrenic Nerve, Open Approach
Extraction of Phrenic Nerve, Perc Endo Approach
Extraction of Phrenic Nerve, Percutaneous Approach