ICD-10 · PDGM grouping
C38 Malignant neoplasm of heart, mediastinum and pleura
All 6 codes in the C38 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
6
Can lead a claim
6
Cannot lead a claim
0
What CMS assigns to C38
All 6 codes group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases. All 6 count toward the Malignant Neoplasm of Trachea, Bronchus, Lung, and Mediastinum comorbidity subgroup. Every code can lead a claim.
- Malignant Neoplasm of Trachea, Bronchus, Lung, and Mediastinum: can award the low comorbidity tier as a secondary diagnosis.
Every code in C38
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 |
|---|---|---|---|---|
| C38.0 | Malignant neoplasm of heart | Can lead a claim | K | Malignant Neoplasm of Trachea, Bronchus, Lung, and Mediastinum |
| C38.1 | Malignant neoplasm of anterior mediastinum | Can lead a claim | K | Malignant Neoplasm of Trachea, Bronchus, Lung, and Mediastinum |
| C38.2 | Malignant neoplasm of posterior mediastinum | Can lead a claim | K | Malignant Neoplasm of Trachea, Bronchus, Lung, and Mediastinum |
| C38.3 | Malignant neoplasm of mediastinum, part unspecified | Can lead a claim | K | Malignant Neoplasm of Trachea, Bronchus, Lung, and Mediastinum |
| C38.4 | Malignant neoplasm of pleura | Can lead a claim | K | Malignant Neoplasm of Trachea, Bronchus, Lung, and Mediastinum |
| C38.8 | Malignant neoplasm of overlapping sites of heart, mediastinum and pleuraCMS: Malig neoplm of ovrlp sites of heart, mediastinum and pleura | Can lead a claim | K | Malignant Neoplasm of Trachea, Bronchus, Lung, and Mediastinum |
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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