ICD-10 Code K63.3 – Ulcer of intestine (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K63.3 – Ulcer of intestine
What it is
K63.3 identifies an ulcer located in the intestine. Use it when documentation shows a true intestinal ulcer, rather than nonspecific abdominal pain or inflammation.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings may include abdominal pain, gastrointestinal bleeding, anemia, or endoscopic evidence of an ulcerated intestinal lesion.
When to use this code
Use K63.3 when the provider documents an intestinal ulcer as the confirmed diagnosis. It may be supported by endoscopy, imaging, pathology, or operative findings. Code the documented site and etiology if the record specifies a more precise cause.
Do not use for
Do not use this code for peptic ulcer disease, colitis, diverticulitis, or nonspecific gastrointestinal symptoms without a documented intestinal ulcer. Check documentation if the location is unclear.
Coding tip
Verify that “ulcer” refers to the intestine and not the stomach, duodenum, or anus before assigning K63.3.