C49.A3 — Gastrointestinal stromal tumor of small intestine
C49.A3 is a billable, specific ICD-10-CM code for gastrointestinal stromal tumor of small intestine. It is valid for submission on a claim.
Risk adjustment
C49.A3 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 23 Prostate, Breast, and Other Cancers and Tumors0.186 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
C49.A3 is named in 63 Medicare coverage policies — 63 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
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- A52986Billing and Coding: Biomarkers for Oncology
How C49.A3 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to C49.A3.
- Tumor›stromal›gastrointestinal›small intestine
- Tumor›stromal›gastrointestinal›malignant›duodenum
- Tumor›stromal›gastrointestinal›malignant›ileum
- Tumor›stromal›gastrointestinal›malignant›jejunum
- Tumor›stromal›gastrointestinal›malignant›Meckel diverticulum
- Tumor›stromal›gastrointestinal›malignant›small intestine
- Tumor›stromal›intestine›malignant›small
Related codes at this level
Codes that share C49.A. If C49.A3 is not quite right, the correct code is usually one of these.
- C49.A0Gastrointestinal stromal tumor, unspecified site
- C49.A1Gastrointestinal stromal tumor of esophagus
- C49.A2Gastrointestinal stromal tumor of stomach
- C49.A4Gastrointestinal stromal tumor of large intestine
- C49.A5Gastrointestinal stromal tumor of rectum
- C49.A9Gastrointestinal stromal tumor of other sites
Questions about C49.A3
- Is C49.A3 a billable ICD-10-CM code?
- Yes. C49.A3 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does C49.A3 sit in the tabular list?
- Neoplasms (C00-D49), in the block Malignant neoplasms of mesothelial and soft tissue (C45-C49).