Upper gastrointestinal endoscopy including esophagus, stomach, and either the duodenum and/or jejunum as appropriate; with transendoscopic ultrasound-guided transmural injection of diagnostic or therapeutic substance(s) (eg,
anesthetic, neurolytic agent) or fiducial marker(s)
(includes endoscopic ultrasound examination of the
esophagus, stomach, and either the duodenum or a
surgically altered stomach where the jejunum is
examined distal to the anastomosis)                                                          