C24.0
BillableMalignant neoplasm of extrahepatic bile duct
HCC Category Mapping
V28HCC 20 — Lung and Other Severe Cancers
0.000V24HCC 9 — Lung and Other Severe Cancers
0.973ESRDHCC 9 — Lung and Other Severe Cancers
0.000RxHCCHCC 22 — Cancer, Other Specified Sites
0.000What This Code Means
Cancer that starts in the bile ducts outside the liver. These ducts carry bile from the liver and gallbladder to the small intestine.
Coding Tips
- •Distinguish from intrahepatic bile duct cancer (C22.1) which occurs within the liver
- •Document the specific location and stage of the tumor for accurate coding and treatment planning
Clinical Significance
Malignant neoplasm of the extrahepatic bile duct (extrahepatic cholangiocarcinoma) includes cancers of the common hepatic duct, common bile duct, and cystic duct outside the liver parenchyma. This includes the clinically important Klatskin tumor (perihilar cholangiocarcinoma), which occurs at the hepatic duct bifurcation. These cancers are significant for risk adjustment because they are aggressive, often unresectable at presentation, and require complex multidisciplinary management.
Documentation Requirements
- ✓Documentation confirming extrahepatic bile duct as the primary tumor location
- ✓Specific location within the extrahepatic ducts (perihilar vs distal)
- ✓Bismuth-Corlette classification for perihilar tumors if applicable
- ✓Histological confirmation of carcinoma
- ✓Stage of disease and resectability assessment
Commonly Confused Codes
C22.1 — Intrahepatic bile duct carcinoma: intrahepatic cholangiocarcinoma occurs within the liver; C24.0 is for ducts outside the liverC24.1 — Ampulla of Vater: the ampulla is the distal opening; cancers of the ampulla have different prognosis and treatmentC23 — Gallbladder cancer: the gallbladder connects to the bile duct via the cystic duct; verify primary siteC25.0 — Head of pancreas: pancreatic head tumors may compress or invade the bile duct; code the primary site
Code Hierarchy
└C24Malignant neoplasm of other and unspecified parts of biliary tract└C24.0Malignant neoplasm of extrahepatic bile duct
└C24.0Malignant neoplasm of extrahepatic bile duct