Malignant neoplasm of intrahepatic bile ducts

This code signifies a primary cancerous tumor originating within the bile ducts located inside the liver. This malignancy, also known as intrahepatic cholangiocarcinoma, is a serious and often aggressive form of liver cancer.

Apply this code when documentation explicitly states a diagnosis of malignant neoplasm of the intrahepatic bile ducts. This is appropriate for initial diagnosis, treatment, and follow-up care for this specific type of liver cancer.

• Differentiate from malignant neoplasms of the extrahepatic bile ducts (e.g., common bile duct, ampulla of Vater).
• Ensure the documentation specifies "intrahepatic" to avoid miscoding other bile duct cancers.
• Sequence as the primary diagnosis when it is the reason for the encounter, followed by any metastases.