ICD-10 · PDGM grouping
C80 Malignant neoplasm without specification of site
All 3 codes in the C80 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
1
Cannot lead a claim
2
What CMS assigns to C80
1 of the 3 codes groups to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases; 2 are assigned no clinical group. 2 of the 3 count toward the Secondary neoplasm of urinary and reproductive systems, skin, brain, and bone comorbidity subgroup; 1 is assigned none. 1 of the 3 can lead a claim. CMS attaches a code-first note to 1 of the 3.
- Secondary neoplasm of urinary and reproductive systems, skin, brain, and bone: can award the low comorbidity tier as a secondary diagnosis.
Code first
CMS grouper convention 6, on C80.2. Code first:
- complication of transplanted organ (T86.-)
Every code in C80
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 |
|---|---|---|---|---|
| C80.0 | Disseminated malignant neoplasm, unspecified | Can lead a claim | K | Secondary neoplasm of urinary and reproductive systems, skin, brain, and bone |
| C80.1 | Malignant (primary) neoplasm, unspecified | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| C80.2 | Malignant neoplasm associated with transplanted organ | Cannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosis | None | Secondary neoplasm of urinary and reproductive systems, skin, brain, and bone |
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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