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 BT1FZ
Fluoroscopy Kidney, Ureter, Bladder, L w L Osm Contrast
Fluoroscopy Kidney, Ureter, Bladder, L w H Osm Contrast
Fluoroscopy of Kidney, Ureter, Bladder, L using Oth Contrast
Fluoroscopy of Left Kidney, Ureter and Bladder