2026 ICD-10-CM Diagnosis Code K31.811Angiodysplasia of stomach and duodenum with bleeding

ICD-10-CM Codes›K00–K95›K20-K31›K31

ICD-10-CM K31.811
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

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. 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

ICD-10-CM Code
K31.811
Billable Status
Yes — Valid for Submission
Code Describes
Angiodysplasia of stomach and duodenum with bleeding
Short Description
Angiodysplasia of stomach and duodenum with bleeding
Same as the full description in the CMS dataset.
Parent Code
K31.81
Angiodysplasia of stomach and duodenum

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK31Other diseases of stomach and duodenum
This CodeK31.811Angiodysplasia of stomach and duodenum with bleeding

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.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Angiodysplasia(cecum) (colon)
      • duodenum (and stomach)
        • with bleeding
    • Angiodysplasia(cecum) (colon)
      • stomach (and duodenum)
        • with bleeding
    • Ectasia, ectasis
      • gastric antral vascular (GAVE)
        • with hemorrhage
    • Watermelon stomach
      • with hemorrhage

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DIG021
Gastrointestinal hemorrhage
Default principal diagnosis: inpatient No · outpatient No
CCSR DIG008
Other specified and unspecified disorders of stomach and duodenum
Default principal diagnosis: inpatient Yes · outpatient Yes

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

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert K31.811 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
537.83 Angio stm/dudn w hmrhg
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K31.811Overview

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.

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.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.