Carcinoma in situ of liver, gallbladder and bile ducts

This code signifies the presence of abnormal, non-invasive cells confined to the epithelial layer of the liver, gallbladder, or bile ducts. These cells have the potential to become cancerous but have not yet spread to surrounding tissues. It represents a pre-malignant condition.

Use this code when pathology reports confirm carcinoma in situ within the liver parenchyma, gallbladder wall, or the lining of the intrahepatic or extrahepatic bile ducts. Documentation must explicitly state "carcinoma in situ" or "CIS" for these specific anatomical sites.

• Distinguish carefully between carcinoma in situ and malignant neoplasm (C codes), as the latter indicates invasion.
• Ensure the documentation specifies "in situ" and the exact anatomical location (liver, gallbladder, or bile ducts).
• Do not use this code for dysplasia or atypical hyperplasia, which are less severe pre-malignant conditions.