C49.A2Gastrointestinal stromal tumor of stomach

C49.A2 is the ICD-10-CM diagnosis code for gastrointestinal stromal tumor of stomach. It belongs to category C49 (malignant neoplasm of other connective and soft tissue), block C45-C49 (malignant neoplasms of mesothelial and soft tissue) and chapter 2 (neoplasms). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within C49.A (gastrointestinal stromal tumor), C49.A2 is specifically for gastrointestinal stromal tumor of stomach. Related codes cover unspecified site (C49.A0), of esophagus (C49.A1), of small intestine (C49.A3), of large intestine (C49.A4), of rectum (C49.A5) and of other sites (C49.A9).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 374 (Digestive Malignancy with MCC, relative weight 2.1109), DRG 375 (Digestive Malignancy with CC, relative weight 1.1838) and DRG 376 (Digestive Malignancy without CC/MCC, relative weight 0.8929), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It was added in FY2017, effective October 1, 2016.

Before ICD-10, this condition was coded in ICD-9-CM as 171.5 (malignant neoplasm of connective and other soft tissue of abdomen).