2026 ICD-10-CM Diagnosis Code K29.51Unspecified chronic gastritis with bleeding
ICD-10-CM Codes›K00–K95›K20-K31›K29
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Chronic Condition
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. 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 chronic antral gastritis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastritis and duodenitis and Gastrointestinal hemorrhage.
Code Identity
Code Classification
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.
with bleeding K29.51
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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
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Convert K29.51 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About K29.51Overview
What is the ICD-10 code for unspecified chronic gastritis with bleeding?
The ICD-10-CM code for unspecified chronic gastritis with bleeding is K29.51 (sometimes written as K2951). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
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.
Is K29.51 a CC or MCC?
CMS lists K29.51 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 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.
