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  2. ICD-10-CM Codes List
  3. C00–D49
  4. C15-C26
  5. Malignant neoplasm of other and unspecified parts of biliary tract (C24)

Malignant neoplasm of other and unspecified parts of biliary tract (C24)

The ICD-10 codes C24 and its subcodes classify malignant neoplasms of various parts of the biliary tract, including the extrahepatic bile duct, ampulla of Vater, overlapping sites, and unspecified regions. These codes specifically identify cancers originating in these areas, essential for accurate diagnosis and treatment documentation.

The code C24.0 covers cancers of the extrahepatic bile duct and includes common terms like "primary cholangiocarcinoma of extrahepatic bile duct" or "Klatskin tumor," helping coders link these synonyms to this specific code. C24.1 refers to malignant tumors of the ampulla of Vater, capturing conditions also known as "primary carcinoma of ampulla of Vater" or "adenocarcinoma of small intestine," clarifying the site of malignancy. C24.8 is used when tumors overlap multiple biliary tract sites, encompassing terms like "carcinoma of gallbladder and extrahepatic biliary tract." When the exact location is not specified, C24.9 applies, covering general biliary tract malignancies, including references to "malignant tumor of biliary tract" or "primary adenocarcinoma of biliary tract." Understanding these codes aids medical coders in accurately classifying biliary tract cancers from a range of diagnostic terminology.

Instructional Notations

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

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Ampulla of Vater

A dilation of the duodenal papilla that is the opening of the juncture of the COMMON BILE DUCT and the MAIN PANCREATIC DUCT, also known as the hepatopancreatic ampulla.