C24.9
BillableMalignant neoplasm of biliary tract, unspecified
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 of the biliary tract (bile ducts and related structures) when the specific location cannot be determined or is not specified.
Coding Tips
- •This is a less specific code; use only when the exact site of the biliary tract cancer is unknown
- •Query the provider if more specific anatomical information is available to allow for more precise coding
Clinical Significance
Unspecified biliary tract cancer is used when malignancy is confirmed in the biliary system but the specific anatomical site cannot be determined. The biliary tract includes the gallbladder, cystic duct, hepatic ducts, common bile duct, and ampulla of Vater. Determining the exact primary site is clinically important because prognosis and treatment vary significantly between biliary tract subsites. This code should prompt a review of imaging and pathology for more specific site determination.
Documentation Requirements
- ✓Confirmed malignancy of the biliary tract
- ✓Review of imaging (magnetic resonance cholangiopancreatography, computed tomography, endoscopic ultrasound) for site identification
- ✓Pathology results if biopsy performed
- ✓Tumor markers (cancer antigen 19-9, carcinoembryonic antigen)
- ✓Treatment status and planned workup
Commonly Confused Codes
Code Hierarchy
└C24Malignant neoplasm of other and unspecified parts of biliary tract└C24.9Malignant neoplasm of biliary tract, unspecified
└C24.9Malignant neoplasm of biliary tract, unspecified