The Qualifier None is identified by letter "Z" and occupies the 6th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to B54TZZ
Ultrasonography of Portal and Splanchnic Veins, Intravasc
Ultrasonography of Portal and Splanchnic Veins, Guidance
Ultrasonography of Portal and Splanchnic Veins