ICD-10 Code C17.1 – Malignant neoplasm of jejunum (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C17.1 – Malignant neoplasm of jejunum
What it is
C17.1 identifies a malignant tumor arising in the jejunum, the middle segment of the small intestine. Use it when documentation specifies jejunal cancer rather than a general small-bowel or intestinal malignancy.
Clinical signs
Clinical features vary; refer to documentation. Jejunal malignancy may present with abdominal pain, weight loss, anemia, obstruction, or bleeding, but you should code only what is documented.
When to use this code
Use C17.1 when the provider documents primary cancer of the jejunum, including pathology or imaging-confirmed malignant neoplasm. Apply it for active disease, initial workup, or ongoing management when the jejunum is the stated site. If the record says “small intestine cancer” without a site, check documentation before assigning this code.
Do not use for
Do not use C17.1 for benign jejunal tumors, metastatic disease to the jejunum, or nonspecific intestinal masses. If the location is uncertain or another small-intestine segment is named, code that documented site instead.
Coding tip
Confirm the exact anatomic site in the operative note, pathology report, or assessment before coding, because small-intestine cancers are site-specific.