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 B31BZ
Fluoroscopy of L Ext Carotid using L Osm Contrast
Fluoroscopy L Ext Carotid w Oth Contrast, Laser Intraop
Fluoroscopy L Ext Carotid w H Osm Contrast, Laser Intraop
Fluoroscopy of Left External Carotid Artery
Fluoroscopy of L Ext Carotid using Oth Contrast
Fluoroscopy of L Ext Carotid using H Osm Contrast
Fluoroscopy L Ext Carotid w L Osm Contrast, Laser Intraop