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 B307Z
Plain Radiography of L Int Carotid using L Osm Contrast
Plain Radiography of L Int Carotid using H Osm Contrast
Plain Radiography of Left Internal Carotid Artery
Plain Radiography of L Int Carotid using Oth Contrast