ICD-10 Code C24.8 – Malignant neoplasm of overlapping sites of biliary tract (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C24.8 – Malignant neoplasm of overlapping sites of biliary tract
What it is
C24.8 identifies a malignant tumor of the biliary tract that involves overlapping sites, meaning the cancer cannot be assigned to one single adjacent biliary location. Use it when the record clearly documents this specific anatomic pattern.
Clinical signs
Clinical features vary; refer to documentation. Standard findings may include obstructive jaundice, abdominal pain, pruritus, weight loss, or imaging evidence of a biliary tract mass involving more than one site.
When to use this code
Use this code when the provider documents a malignant neoplasm of overlapping sites in the biliary tract and does not specify a single primary site. It is appropriate for confirmed cancers involving contiguous biliary structures. If the site is later clarified, code the more specific location instead.
Do not use for
Do not use C24.8 for benign biliary disease, suspected malignancy, or cancers limited to one clearly documented biliary site. Check documentation if the record only says “biliary tract cancer” without overlap details.
Coding tip
Assign C24.8 only when overlap is explicitly documented; otherwise, query for the exact primary site.