Is C24 a billable ICD-10-CM code?

No. C24 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does C24 sit in the tabular list?

Neoplasms (C00-D49), in the block Malignant neoplasms of digestive organs (C15-C26).

What cannot be coded together with C24?

C24 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

C24

C24 — Malignant neoplasm of other and unspecified parts of biliary tract

Non-billable headerICD-10-CM

C24 is a non-billable header ICD-10-CM code for malignant neoplasm of other and unspecified parts of biliary tract. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

malignant neoplasm of intrahepatic bile duct (C22.1)

Other codes that can never be billed with C24

These codes carry an Excludes1 note pointing at C24. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C24 alone.

C22Malignant neoplasm of liver and intrahepatic bile ducts
C22.1Intrahepatic bile duct carcinoma

Risk adjustment

C24 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead C24

4 child codes. Green means billable.

Questions about C24

Is C24 a billable ICD-10-CM code?: No. C24 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does C24 sit in the tabular list?: Neoplasms (C00-D49), in the block Malignant neoplasms of digestive organs (C15-C26).
What cannot be coded together with C24?: C24 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.