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 BR37Z
Magnetic Resonance Imaging (MRI) of Thoracic Spine
MRI of Thoracic Spine using Oth Contrast
MRI of Thoracic Spine using Oth Contrast, Unenh, Enhance