Malignant neoplasm of other specified sites of gallbladder and extrahepatic bile ducts

This code signifies a primary cancerous tumor originating in specific, less common locations within the gallbladder or the extrahepatic bile ducts, excluding sites with more specific codes. It indicates a malignant process affecting these biliary structures.

Apply this code when documentation clearly specifies a primary malignancy of the gallbladder or extrahepatic bile ducts that is not otherwise classified (e.g., fundus, body, common bile duct). This code is appropriate when the physician's notes indicate "other specified sites" or a location not covered by more granular codes within the 156 series.

• Ensure the documentation specifies "malignant" and "primary" for the neoplasm.
• Carefully review for more specific anatomical sites within the gallbladder or extrahepatic bile ducts (e.g., cystic duct, ampulla of Vater) which may have dedicated codes.
• Do not use for secondary malignancies or benign neoplasms; these require different code assignments.