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 B33MZ
Magnetic Resonance Imaging (MRI) of Spinal Arteries
MRI of Spinal Art using Oth Contrast
MRI of Spinal Art using Oth Contrast, Unenh, Enhance