C26 vs C48
C26 (Malignant neoplasm of other and ill-defined digestive organs) compared with C48 (Malignant neoplasm of retroperitoneum and peritoneum), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. C26 carries an Excludes1 note covering C48: “malignant neoplasm of peritoneum and retroperitoneum (C48.-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| C26Malignant neoplasm of other and ill-defined digestive organs | C48Malignant neoplasm of retroperitoneum and peritoneum | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of other and ill-defined digestive organs is a non-billable ICD-10-CM category code (C26). | Malignant neoplasm of retroperitoneum and peritoneum is a non-billable ICD-10-CM category code (C48). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources