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 B547Z
Ultrasonography of Left Subclavian Vein
Ultrasonography of Left Subclavian Vein, Intravascular
Ultrasonography of Left Subclavian Vein, Guidance