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 B54TZ
Ultrasonography of Portal and Splanchnic Veins, Guidance
Ultrasonography of Portal and Splanchnic Veins
Ultrasonography of Portal and Splanchnic Veins, Intravasc