ICD-10 Code C17.2 – Malignant neoplasm of ileum (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C17.2 – Malignant neoplasm of ileum
What it is
C17.2 identifies a malignant tumor arising in the ileum, the final segment of the small intestine. Use it when the record documents primary cancer of the ileum.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include abdominal pain, anemia, weight loss, bowel obstruction, or imaging and biopsy evidence of an ileal malignancy.
When to use this code
Use C17.2 when the provider documents a primary malignant neoplasm of the ileum, including confirmed pathology or clear clinical diagnosis. Code it for encounters focused on the cancer itself, such as evaluation, staging, or follow-up of known disease. If the site is described only as small intestine without further detail, check documentation.
Do not use for
Do not use this code for benign ileal tumors, metastatic disease to the ileum, or unspecified small-intestine cancer. If the documentation does not clearly identify the ileum as the primary site, check documentation.
Coding tip
Verify that the ileum is named as the primary site before assigning C17.2.