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 B24CZ
Ultrasonography of Pericardium, Transesophageal
Ultrasonography of Pericardium using Other Contrast
Ultrasonography of Pericardium
Ultrasonography of Pericardium, Intravascular