2026 ICD-10-CM Diagnosis Code K31.819Angiodysplasia of stomach and duodenum without bleeding

ICD-10-CM Codes›K00–K95›K20-K31›K31

ICD-10-CM K31.819
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K31.819 is a billable ICD-10-CM diagnosis code for angiodysplasia of stomach and duodenum without bleeding. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 391 through 392. Coders also document this condition as angiodysplasia of gastrointestinal tract. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified disorders of stomach and duodenum.

Code Identity

ICD-10-CM Code
K31.819
Billable Status
Yes — Valid for Submission
Code Describes
Angiodysplasia of stomach and duodenum without bleeding
Short Description
Angiodysplasia of stomach and duodenum without 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 CodeK31.819Angiodysplasia of stomach and duodenum without bleeding

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Angiodysplasia of gastrointestinal tract
  • Angiodysplasia of stomach
  • Vascular ectasia of gastric antrum

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Angiodysplasia of stomach and duodenum NOS

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)
    • Angiodysplasia(cecum) (colon)
      • stomach (and duodenum)
    • Ectasia, ectasis
      • gastric antral vascular (GAVE)
    • Ectasia, ectasis
      • gastric antral vascular (GAVE)
        • without hemorrhage
    • Watermelon stomach
    • Watermelon stomach
      • without hemorrhage

Clinical ClassificationClinical

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

CCSR DIG008
Other specified and unspecified disorders of stomach and duodenum
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Gastric Dysplasia

    a morphologic finding indicating the presence of dysplastic changes within the gastric mucosal epithelial cells.

  • Indefinite for Gastric Dysplasia|Indefinite for Gastric Intraepithelial Neoplasia

    a term used to describe an ambiguous morphologic pattern in the gastric mucosa, when there is doubt whether the findings represent a non-neoplastic or neoplastic pathologic process.

  • Negative for Gastric Dysplasia|Negative for Gastric Intraepithelial Neoplasia

    a morphologic finding indicating the absence of dysplastic changes in the gastric mucosal epithelium. it includes non-neoplastic inflammatory, reactive, or metaplastic pathologic processes.

Patient EducationClinical

Stomach Disorders

Your stomach is an organ between your esophagus and small intestine. It is where digestion of protein begins. The stomach has three tasks. It stores swallowed food. It mixes the food with stomach acids. Then it sends the mixture on to the small intestine.

Read the full article at MedlinePlus

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

Convert K31.819 to ICD-9-CMHistory

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

ICD-9-CM
537.82 Angio stm/dudn w/o 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 K31.819Overview

Is K31.819 (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 without bleeding on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K31.819 group to?

When angiodysplasia of stomach and duodenum without bleeding is the principal diagnosis on an inpatient stay, it groups to MS-DRG 391, 392, with relative weights from 0.7796 to 1.2683 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K31.819?

Under the General Equivalence Mappings, angiodysplasia of stomach and duodenum without bleeding converts to ICD-9-CM 537.82 (angio stm/dudn w/o hmrhg). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.