2026 ICD-10-CM Diagnosis Code K29.91Gastroduodenitis, unspecified, with bleeding

ICD-10-CM Codes›K00–K95›K20-K31›K29

ICD-10-CM K29.91
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K29.91 is a billable ICD-10-CM diagnosis code for gastroduodenitis, unspecified, 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastritis and duodenitis and Gastrointestinal hemorrhage.

Code Identity

ICD-10-CM Code
K29.91
Billable Status
Yes — Valid for Submission
Code Describes
Gastroduodenitis, unspecified, with bleeding
Short Description
Gastroduodenitis, unspecified, with bleeding
Same as the full description in the CMS dataset.
Parent Code
K29.9
Gastroduodenitis, unspecified

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK29Gastritis and duodenitis
This CodeK29.91Gastroduodenitis, unspecified, with bleeding

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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

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 K29.91 to ICD-9-CMHistory

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

ICD-9-CM
535.51 Gstr/ddnts NOS 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 K29.91Overview

What is the ICD-10 code for gastroduodenitis, unspecified, with bleeding?

The ICD-10-CM code for gastroduodenitis, unspecified, with bleeding is K29.91 (sometimes written as K2991). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is K29.91 (Gastroduodenitis, unspecified) a billable code?

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

What MS-DRG does K29.91 group to?

When gastroduodenitis, unspecified, 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 K29.91 a CC or MCC?

CMS lists K29.91 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 K29.91?

Under the General Equivalence Mappings, gastroduodenitis, unspecified, with bleeding converts to ICD-9-CM 535.51 (gstr/ddnts NOS w hmrhg). The mapping is approximate, so confirm the match fits the documentation.