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 B54LZ
Ultrasonography of Bilateral Renal Veins
Ultrasonography of Bilateral Renal Veins, Intravascular
Ultrasonography of Bilateral Renal Veins, Guidance