2026 ICD-10-CM Diagnosis Code K29.51Unspecified chronic gastritis with bleeding

ICD-10-CM Codes›K00–K95›K20-K31›K29

ICD-10-CM K29.51
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K29.51 is a billable ICD-10-CM diagnosis code for unspecified chronic gastritis 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 chronic antral gastritis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastritis and duodenitis and Gastrointestinal hemorrhage.

Code Identity

ICD-10-CM Code
K29.51
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified chronic gastritis with bleeding
Short Description
Unspecified chronic gastritis with bleeding
Same as the full description in the CMS dataset.
Parent Code
K29.5
Unspecified chronic gastritis

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK29Gastritis and duodenitis
This CodeK29.51Unspecified chronic gastritis with bleeding

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic antral gastritis
  • Chronic antral gastritis with hemorrhage

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.

    • Antritis
      • stomach
        • with bleeding
    • Gastritis(simple)
      • chronic (antral) (fundal)
        • with bleeding

Clinical ClassificationClinical

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

CCSR DIG007
Gastritis and duodenitis
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR DIG021
Gastrointestinal hemorrhage
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Autoimmune Atrophic Chronic Gastritis|Autoimmune atrophic chronic gastritis

    chronic atrophic gastritis that is caused by autoimmune destruction of parietal cells in the stomach resulting in hypochlorhydria and decreased production of intrinsic factor.

  • Chronic Gastritis

    inflammation of the stomach that is chronic in nature.

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 K29.51 to ICD-9-CMHistory

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

ICD-9-CM
535.11 Atrph gastritis w hmrhg
Approximate The match is approximate rather than exact.

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 K29.51Overview

Is K29.51 (Unspecified chronic gastritis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified chronic gastritis with bleeding on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K29.51 group to?

When unspecified chronic gastritis 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 K29.51?

Under the General Equivalence Mappings, unspecified chronic gastritis with bleeding converts to ICD-9-CM 535.11 (atrph gastritis w hmrhg). The mapping is approximate, so confirm the match fits the documentation.

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.