The Qualifier None is identified by letter "Z" and occupies the 6th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to B240ZZ
Ultrasonography of Single Coronary Artery using Oth Contrast
Ultrasonography of Single Coronary Artery, Transesophageal
Ultrasonography of Single Coronary Artery, Intravascular
Ultrasonography of Single Coronary Artery