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 BQ08Z
Plain Radiography of Left Knee
Plain Radiography of Left Knee using High Osmolar Contrast
Plain Radiography of Left Knee using Low Osmolar Contrast
Plain Radiography of Left Knee using Other Contrast