Endoscopic ultrasound (endoscopy with ultrasound imaging), with or without biopsy, for the diagnosis of one or more of pancreatic, biliary or gastric submucosal tumours, not in association with another item in this Subgroup (other than item 30484, 30485, 30491 or 30494) and other than a service associated with the routine monitoring of chronic pancreatitis (H) (Anaes.)