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 B31QZ
Fluoroscopy Cerv-cereb Arch w H Osm Contrast, Laser Intraop
Fluoroscopy of Cervico-Cerebral Arch
Fluoroscopy of Cervico-Cerebral Arch using H Osm Contrast
Fluoroscopy Cerv-cereb Arch w L Osm Contrast, Laser Intraop
Fluoroscopy of Cervico-Cerebral Arch using L Osm Contrast
Fluoroscopy of Cervico-Cerebral Arch using Other Contrast
Fluoroscopy Cerv-cereb Arch w Oth Contrast, Laser Intraop