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 B039Z
Magnetic Resonance Imaging (MRI) of Sella Tur/Pituitary
MRI Sella Tur/Pituitary w Oth Contrast, Unenh, Enhance
MRI of Sella Tur/Pituitary using Oth Contrast