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 B00BZ
Plain Radiography of Spinal Cord using High Osmolar Contrast
Plain Radiography of Spinal Cord using Other Contrast
Plain Radiography of Spinal Cord
Plain Radiography of Spinal Cord using Low Osmolar Contrast