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 B538Z
MRI of Sup Vena Cava using Oth Contrast, Unenh, Enhance
MRI of Sup Vena Cava using Oth Contrast
Magnetic Resonance Imaging (MRI) of Superior Vena Cava