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 B438Z
MRI of Bi Renal Art using Oth Contrast, Unenh, Enhance
Magnetic Resonance Imaging (MRI) of Bilateral Renal Arteries
MRI of Bi Renal Art using Oth Contrast