Table 2. ICD Code descriptions.

Procedures Bypass coronary artery one vessel Bypass coronary artery two vessels Bypass coronary artery three vessels Bypass coronary artery four vessels Endoscopy esophagus Endoscopy jejunum Endoscopy stomach Biopsy gastroesophageal junction Biopsy duodenum endscopic Biopsy duodenum brush Biopsy esophagus Biopsy jejunum closed Biopsy stomach closed

Diagnosis Unspecified esophagitis Other esophagitis Ulcer of esophagitis Esophageal haemorrhage Mallory Weiss syndrome Acute gastric ulcer with haemorrhage +/– perforation Chronic or unspecified gastric ulcer with haemorrhage +/– perforation Acute duodenal ulcer with haemorrhage +/– perforation Chroni/unspecified duodenal ulcer with haemorrhage +/– perforation Acute peptic ulcer with haemorrhage +/– perforation Chronic/unspecified peptic ulcer with haemorrhage +/– perforation Acute gastroesophageal ulcer with haemorrhage +/– perforation Chronic/unspecified gastroesophageal ulcer with haemorrhage +/– perforation Acute gastritis/duodenitis Unspecified gastric and duodenitis Dieulafoy’s lesion