ICD-10 · PDGM grouping
C24 Malignant neoplasm of other and unspecified parts of biliary tract
All 4 codes in the C24 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
4
Can lead a claim
4
Cannot lead a claim
0
What CMS assigns to C24
All 4 codes group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases. All 4 count toward the Malignant Neoplasm of Liver and Intrahepatic Bile Ducts comorbidity subgroup. Every code can lead a claim.
- Malignant Neoplasm of Liver and Intrahepatic Bile Ducts
Every code in C24
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| C24.0 | Malignant neoplasm of extrahepatic bile duct | Can lead a claim | K | Malignant Neoplasm of Liver and Intrahepatic Bile Ducts |
| C24.1 | Malignant neoplasm of ampulla of Vater | Can lead a claim | K | Malignant Neoplasm of Liver and Intrahepatic Bile Ducts |
| C24.8 | Malignant neoplasm of overlapping sites of biliary tract | Can lead a claim | K | Malignant Neoplasm of Liver and Intrahepatic Bile Ducts |
| C24.9 | Malignant neoplasm of biliary tract, unspecified | Can lead a claim | K | Malignant Neoplasm of Liver and Intrahepatic Bile Ducts |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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