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 B24BYZ
Ultrasonography of Heart with Aorta
Ultrasonography of Heart with Aorta, Intravascular
Ultrasonography of Heart with Aorta, Transesophageal
Ultrasonography of Heart with Aorta using Other Contrast