ICD-10 · PDGM grouping
C26 Malignant neoplasm of other and ill-defined digestive organs
All 3 codes in the C26 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
3
Can lead a claim
3
Cannot lead a claim
0
What CMS assigns to C26
All 3 codes group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases. All 3 count toward the Malignant neoplasm of Digestive Organs, includes Gastrointestinal Cancers comorbidity subgroup. Every code can lead a claim.
- Malignant neoplasm of Digestive Organs, includes Gastrointestinal Cancers: can award the low comorbidity tier as a secondary diagnosis.
Every code in C26
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 |
|---|---|---|---|---|
| C26.0 | Malignant neoplasm of intestinal tract, part unspecified | Can lead a claim | K | Malignant neoplasm of Digestive Organs, includes Gastrointestinal Cancers |
| C26.1 | Malignant neoplasm of spleen | Can lead a claim | K | Malignant neoplasm of Digestive Organs, includes Gastrointestinal Cancers |
| C26.9 | Malignant neoplasm of ill-defined sites within the digestive systemCMS: Malignant neoplasm of ill-defined sites within the dgstv sys | Can lead a claim | K | Malignant neoplasm of Digestive Organs, includes Gastrointestinal Cancers |
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.
The monthly home health regs digest
What CMS changed, what's due next, and what to do about it — one email a month, no fluff. Read the first issue