ICD-10-CM 2027 diagnosis code

C24Malignant neoplasm of other and unspecified parts of biliary tract

Not billable — use a more specific code

C24 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.Short description: Malignant neoplasm of other and unsp parts of biliary tract

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About C24

C24 is the ICD-10-CM diagnosis code for malignant neoplasm of other and unspecified parts of biliary tract. It belongs to block C15-C26 (malignant neoplasms of digestive organs) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: C24.0 (duct), C24.1 (vater), C24.8 (tract) and C24.9 (unspecified).

Don't report C24 together with the conditions in its Excludes1 note: malignant neoplasm of intrahepatic bile duct (C22.1).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under C24

Coding notes

Excludes1Not coded here — never report together with this code

malignant neoplasm of intrahepatic bile duct (C22.1)

Notes that apply from higher levels

Instructions written at a parent level also apply to C24.

Broader instructions also apply from C15-C26 Malignant neoplasms of digestive organs and Chapter 2: Neoplasms.

Code history

2016
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2021
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2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about C24

Is C24 billable?: No. C24 is a header code. Report one of its more specific subcodes instead.