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 B30LZ
Plain Radiography of Intercos/Bronc A using L Osm Contrast
Plain Radiography of Intercos/Bronc A using H Osm Contrast
Plain Radiography of Intercos/Bronc A using Oth Contrast
Plain Radiography of Intercostal and Bronchial Arteries