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C24.8 vs C78.89

C24.8 (Malignant neoplasm of overlapping sites of biliary tract) compared with C78.89 (Secondary malignant neoplasm of other digestive organs), from the official CMS tabular data. C24.8 and C78.89 name the same anatomical site (bile or biliary) with a different neoplasm behavior. MedCoder-derived

Relationship

Informational

Neoplasm table relationship

C78.89
Secondary malignant neoplasm of other digestive organs
↔
C24.8
Malignant neoplasm of overlapping sites of biliary tract

Same anatomical site, different neoplasm behavior.

Same site — primary malignancy (bile or biliary)

The behavior documented for the site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column of the neoplasm table, and therefore which code, applies.

Source: CMS Table of Neoplasms

Can these codes be reported together?

Same site, different neoplasm behavior. C78.89 and C24.8 name the same anatomical site (bile or biliary) with a different neoplasm behavior.

From the CMS/CDC Table of Neoplasms: the behavior documented for that site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column, and therefore which code, applies.

Side by side

C24.8Malignant neoplasm of overlapping sites of biliary tractC78.89Secondary malignant neoplasm of other digestive organs
Billing statusBillableBillable
ClassificationC00-D49 — NeoplasmsC00-D49 — Neoplasms
DefinitionMalignant neoplasm of overlapping sites of biliary tract is a billable ICD-10-CM diagnosis code (C24.8).Secondary malignant neoplasm of other digestive organs is a billable ICD-10-CM diagnosis code (C78.89).
Includes
Malignant neoplasm involving both intrahepatic and extrahepatic bile ducts
Primary malignant neoplasm of two or more contiguous sites of biliary tract
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources