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 B338Z
MRI of Bi Int Carotid using Oth Contrast
Magnetic Resonance Imaging (MRI) of Bi Int Carotid
MRI of Bi Int Carotid using Oth Contrast, Unenh, Enhance