C20 vs C49.A
C20 (Malignant neoplasm of rectum) compared with C49.A (Gastrointestinal stromal tumor), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. C20 carries an Excludes2 note covering C49.A: “gastrointestinal stromal tumors (C49.A-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| C20Malignant neoplasm of rectum | C49.AGastrointestinal stromal tumor | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of rectum is a billable ICD-10-CM diagnosis code (C20). | Gastrointestinal stromal tumor is a non-billable ICD-10-CM category code (C49.A). |
| Includes | Malignant neoplasm of rectal ampulla | malignant neoplasm of blood vessel malignant neoplasm of bursa malignant neoplasm of cartilage malignant neoplasm of fascia |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources