ICD-10 Code C49.A9 – Gastrointestinal stromal tumor of other sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C49.A9 – Gastrointestinal stromal tumor of other sites
What it is
This code identifies a gastrointestinal stromal tumor, or GIST, arising in other specified sites outside the stomach and small intestine. Use it when documentation names a GIST but does not place it in a more specific anatomic category.
Clinical signs
Clinical features vary; refer to documentation. GISTs may be found as an abdominal mass, gastrointestinal bleeding, pain, or incidental imaging findings, with diagnosis confirmed by pathology and site identification.
When to use this code
Use C49.A9 when the provider documents a GIST in an anatomic site not captured by a more specific code, and the record supports the diagnosis. It is also appropriate when the tumor is described as arising from an other specified gastrointestinal site. If the location is unclear, check documentation before coding.
Do not use for
Do not use this code for GISTs with a more specific documented site such as stomach or small intestine. Do not use it for other soft tissue tumors or when the diagnosis is only suspected; check documentation.
Coding tip
Verify the exact tumor site in the pathology or operative report before assigning C49.A9.