ICD-10 Code C24 – Malignant neoplasm of other and unspecified parts of biliary tract (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C24 – Malignant neoplasm of other and unspecified parts of biliary tract
What it is
C24 identifies a malignant neoplasm arising in parts of the biliary tract not separately specified, including biliary structures outside the more specific site codes. Use it when the record documents a cancer of the biliary tract but does not name a more exact location.
Clinical signs
Clinical features vary; refer to documentation. Common findings in biliary tract malignancy may include obstructive jaundice, abdominal pain, pruritus, or weight loss, but you should code only what is documented and diagnosed.
When to use this code
Use C24 when the provider documents a primary malignant neoplasm of the biliary tract and the site is other or unspecified. It is appropriate when pathology, imaging, or operative notes confirm malignancy, but the exact biliary location is not stated. Check documentation if the tumor site is later clarified.
Do not use for
Do not use this code for benign biliary disease, metastatic cancer to the biliary tract, or a more specific biliary site code when the record identifies one. If the documentation is incomplete, check documentation before assigning C24.
Coding tip
Code the most specific biliary site available; reserve C24 for cases where the record supports malignancy but does not specify a more precise location.