The Qualifier None is identified by letter "Z" and occupies the 6th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to BR31YZ
Magnetic Resonance Imaging (MRI) of Cervical Disc(s)
MRI of Cerv Disc using Oth Contrast, Unenh, Enhance
MRI of Cerv Disc using Oth Contrast