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 B231Z
MRI of Mult Cor Art using Oth Contrast, Unenh, Enhance
Magnetic Resonance Imaging (MRI) of Mult Cor Art
MRI of Mult Cor Art using Oth Contrast