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 B31RZ
Fluoroscopy of Intracranial Arteries
Fluoroscopy Intracran Art w H Osm Contrast, Laser Intraop
Fluoroscopy of Intracranial Arteries using L Osm Contrast
Fluoroscopy Intracran Art w L Osm Contrast, Laser Intraop
Fluoroscopy Intracran Art w Oth Contrast, Laser Intraop
Fluoroscopy of Intracranial Arteries using Other Contrast
Fluoroscopy of Intracranial Arteries using H Osm Contrast