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 B240Z
Ultrasonography of Single Coronary Artery using Oth Contrast
Ultrasonography of Single Coronary Artery, Intravascular
Ultrasonography of Single Coronary Artery
Ultrasonography of Single Coronary Artery, Transesophageal