The Contrast None is identified by letter "Z" and occupies the 5th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to B30BZ
Plain Radiography of L Ext Carotid using Oth Contrast
Plain Radiography of L Ext Carotid using L Osm Contrast
Plain Radiography of L Ext Carotid using H Osm Contrast
Plain Radiography of Left External Carotid Artery