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 B539Z
MRI of Inf Vena Cava using Oth Contrast
Magnetic Resonance Imaging (MRI) of Inferior Vena Cava
MRI of Inf Vena Cava using Oth Contrast, Unenh, Enhance