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 B54DZ
Ultrasonography of Bi Low Extrem Vein, Intravasc
Ultrasonography of Bilateral Lower Extremity Veins
Ultrasonography of Bilateral Lower Extremity Veins, Guidance