C22.1
BillableIntrahepatic bile duct carcinoma
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 20 — Cancer, Liver and Intrahepatic Bile Duct
0.000What This Code Means
A cancer that develops in the bile ducts inside the liver. This is a rare type of liver cancer distinct from hepatocellular carcinoma.
Coding Tips
- •Ensure documentation confirms intrahepatic location (inside liver) versus extrahepatic bile ducts
- •Note any associated conditions like primary sclerosing cholangitis or liver fluke infection
Clinical Significance
Intrahepatic cholangiocarcinoma (bile duct carcinoma within the liver) is the second most common primary liver malignancy and is increasing in incidence globally. It is a highly aggressive cancer with limited treatment options and a poor prognosis, with five-year survival rates typically below 10% for advanced disease. Accurate distinction from hepatocellular carcinoma and extrahepatic cholangiocarcinoma is critical because treatment approaches differ significantly.
Documentation Requirements
- ✓Pathological confirmation of intrahepatic cholangiocarcinoma (bile duct origin within the liver)
- ✓Distinction from hepatocellular carcinoma and mixed tumors
- ✓Stage of disease
- ✓Any associated conditions (primary sclerosing cholangitis, liver fluke infection, hepatolithiasis)
- ✓Molecular markers if tested (isocitrate dehydrogenase mutations, fibroblast growth factor receptor fusions)
Excludes 1 — Do NOT code together
- malignant neoplasm of hepatic duct (C24.0)
Commonly Confused Codes
C22.0 — Hepatocellular carcinoma: different cell origin; confirm pathology distinguishes hepatocyte origin from bile duct originC24.0 — Extrahepatic bile duct carcinoma: extrahepatic cholangiocarcinoma occurs outside the liver in the common bile duct and hepatic ductsC22.9 — Liver cancer, not specified: use C22.1 when intrahepatic cholangiocarcinoma is confirmedC78.7 — Secondary malignant neoplasm of liver: metastatic disease, not primary
Code Hierarchy
└C22Malignant neoplasm of liver and intrahepatic bile ducts└C22.1Intrahepatic bile duct carcinoma
└C22.1Intrahepatic bile duct carcinoma