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 BR33Z
Magnetic Resonance Imaging (MRI) of Lumbar Disc(s)
MRI of Lumbar Disc using Oth Contrast, Unenh, Enhance
MRI of Lumbar Disc using Oth Contrast