C26.9
Billable codeMalignant neoplasm of ill-defined sites within the digestive system
The ICD-10 code for malignant neoplasm of ill-defined sites within the digestive system is C26.9.
Clinical notes
Excludes1 (not coded here)
An Excludes1 note is a pure exclusion: the excluded condition and this code should never be reported together, because the two conditions cannot occur at the same time (e.g. a congenital form vs. an acquired form of the same disease).
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Malignant neoplasm of alimentary canal or tract NOS
- Malignant neoplasm of gastrointestinal tract NOS
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •Confirm the excluded condition(s) listed above are not also present — Excludes1 conditions cannot be coded together with this one.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- C26.0Malignant neoplasm of intestinal tract, part unspecified
- C26.1Malignant neoplasm of spleen
- C26.9Malignant neoplasm of ill-defined sites within the digestive system
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 1598Approximate match
- 1599Approximate match
Associated MS-DRGs
C26.9 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.