ICD-10 Code C26.0 – Malignant neoplasm of intestinal tract, part unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C26.0 – Malignant neoplasm of intestinal tract, part unspecified
What it is
C26.0 identifies a malignant tumor in the intestinal tract when the exact bowel segment is not documented. Use it when the record confirms cancer but does not specify the involved intestinal part.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include abdominal pain, change in bowel habits, obstruction, bleeding, or unexplained weight loss, but the diagnosis must be confirmed by provider documentation.
When to use this code
Use C26.0 when the provider documents a primary or malignant neoplasm of the intestinal tract and does not name a specific site. It is appropriate for reports that say “intestinal cancer” or similar nonspecific wording. If the note later identifies the exact location, code that more specific site instead.
Do not use for
Do not use this code for benign tumors, polyps, or inflammatory bowel disease. Also avoid it when the documentation clearly identifies a specific intestinal segment or another digestive organ.
Coding tip
Query the provider when the site is vague, because a more specific intestinal code may be available.