Malignant neoplasm of other and unspecified parts of biliary tract (C24) ICD-10-CM
The C24 code range covers malignant neoplasm of other and unspecified parts of biliary tract with 5 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- malignant neoplasm of intrahepatic bile duct C22.1
Codes in the C24 Range 5 codes · 4 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the C24 range.
Klatskin Tumor
Cholangiocarcinoma arising near or at the confluence of the right and left hepatic ducts (COMMON HEPATIC DUCT). These tumors are generally small, sharply localized, and seldom metastasizing.
Malignant Ampulla of Vater Neoplasm
A primary or metastatic malignant neoplasm involving the ampulla of Vater.
Malignant Biliary Tract Neoplasm
A primary or metastatic malignant neoplasm that affects the intrahepatic bile ducts, hepatic ducts, common bile duct, or cystic duct.
About the C24 Code Range
These cancers affect other or unspecified parts of the biliary tract within the digestive-organ cancer group.
C24 separates them by site: the bile duct outside the liver (C24.0) or the ampulla of Vater (C24.1). Other subdivisions identify overlapping biliary tract sites (C24.8) or an unspecified biliary tract site (C24.9).
Questions About This Page
How many billable codes are in the C24 range?
Of the 5 codes in this range, 4 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the C24 range classify?
The range classifies malignant neoplasm of other and unspecified parts of biliary tract. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
