2026 ICD-10-CM Diagnosis Code K31.811Angiodysplasia of stomach and duodenum with bleeding
ICD-10-CM Codes›K00–K95›K20-K31›K31
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Chronic Condition
K31.811 is a billable ICD-10-CM diagnosis code for angiodysplasia of stomach and duodenum with bleeding. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 377 through 379. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 72 closely related codes. Coders also document this condition as duodenal hemorrhage due to angiodysplasia of duodenum. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastrointestinal hemorrhage and Other specified and unspecified disorders of stomach and duodenum.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Duodenal hemorrhage due to angiodysplasia of duodenum
- Gastric hemorrhage due to angiodysplasia of stomach
- Gastric hemorrhage due to vascular ectasia of gastric antrum
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Angiodysplasia (cecum) (colon) K55.20
duodenum (and stomach) K31.819
with bleeding K31.811
stomach (and duodenum) K31.819
with bleeding K31.811
with hemorrhage K31.811
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Gastrointestinal Bleeding
Your digestive or gastrointestinal (GI) tract includes the esophagus, stomach, small intestine, large intestine or colon, rectum, and anus. Bleeding can come from any of these areas. The amount of bleeding can be so small that only a lab test can find it.
Read the full article at MedlinePlus
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Convert K31.811 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About K31.811Overview
What is the ICD-10 code for angiodysplasia of stomach and duodenum with bleeding?
The ICD-10-CM code for angiodysplasia of stomach and duodenum with bleeding is K31.811 (sometimes written as K31811). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is K31.811 (Angiodysplasia of stomach and duodenum) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report angiodysplasia of stomach and duodenum with bleeding on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does K31.811 group to?
When angiodysplasia of stomach and duodenum with bleeding is the principal diagnosis on an inpatient stay, it groups to MS-DRG 377, 378, 379, with relative weights from 0.6304 to 1.8280 depending on complications. Higher weights mean higher Medicare reimbursement.
Is K31.811 a CC or MCC?
CMS lists K31.811 as an MCC (major complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 72 closely related codes in its exclusion list.
What is the ICD-9 equivalent of K31.811?
Under the General Equivalence Mappings, angiodysplasia of stomach and duodenum with bleeding converts to ICD-9-CM 537.83 (angio stm/dudn w hmrhg). The mapping is a direct match.
