DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

C24 Malignant neoplasm of other and unspecified parts of biliary tract

  • Header · not billable

C24 is not billable. The category heads 4 billable codes in FY2027: the 4 codes directly below it.

Index → code

  • Klatskin's tumor → C24.0
  • TumorKlatskin's → C24.0

Where it sits

  1. Chapter 2 Neoplasms (C00-D49)
  2. C15-C26 Malignant neoplasms of digestive organs (C15-C26)
  3. C24 Malignant neoplasm of other and unspecified parts of biliary tract
Billable codes
4
Subdivisions
4
CC / MCC codes
4 / 0
HCC V28 codes
4
New FY2027
0
Index entries
2

Codes in C24

  1. C24.0
    Malignant neoplasm of extrahepatic bile duct
    BillableCC20
    Inclusion terms 4

    Inclusion terms

    • Malignant neoplasm of biliary duct or passage NOS
    • Malignant neoplasm of common bile duct
    • Malignant neoplasm of cystic duct
    • Malignant neoplasm of hepatic duct
  2. C24.1
    Malignant neoplasm of ampulla of Vater
    BillableCC20
  3. C24.8
    Malignant neoplasm of overlapping sites of biliary tract
    BillableCC20
    Inclusion terms 2

    Inclusion terms

    • Malignant neoplasm involving both intrahepatic and extrahepatic bile ducts
    • Primary malignant neoplasm of two or more contiguous sites of biliary tract
  4. C24.9
    Malignant neoplasm of biliary tract, unspecified
    BillableCC20

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At C24

Excludes1

  • malignant neoplasm of intrahepatic bile duct (C22.1) C22.1

Notes that also apply

Block C15-C26 instructions (Excludes1 1, Excludes2 1): printed on the block page.

Chapter 2 instructions (Notes 8): printed on the chapter 2 page.

Index entries

  • Klatskin's tumor → C24.0
  • TumorKlatskin's → C24.0

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy