Mouth, esophagus (food pipe), stomach, and intestines (K00-K67; K90-K93).
- Hemorrhoids
- Invagination (invagination of a portion of the intestine into the aborally following portion of the intestine).
Symptoms and abnormal clinical and laboratory findings not elsewhere classified (R00-R99).
- Abdominal pain (abdominal pain)
- Dysphagia (difficulty swallowing)
- Hematemesis (vomiting blood; coffee grounds vomiting).
- Melena (blood in the stool)
