2026 ICD-10-CM Diagnosis Code K29.80Duodenitis without bleeding

ICD-10-CM Codes›K00–K95›K20-K31›K29

ICD-10-CM K29.80
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K29.80 is a billable ICD-10-CM diagnosis code for duodenitis 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastritis and duodenitis.

Code Identity

ICD-10-CM Code
K29.80
Billable Status
Yes — Valid for Submission
Code Describes
Duodenitis without bleeding
Short Description
Duodenitis without bleeding
Same as the full description in the CMS dataset.
Parent Code
K29.8
Duodenitis

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK29Gastritis and duodenitis
This CodeK29.80Duodenitis without bleeding

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute duodenitis
  • Allergic duodenitis
  • Ancylostomiasis
  • Bacterial duodenitis
  • Chronic duodenitis
  • Chronic inflammatory small bowel disease
  • Cytomegaloviral enteritis
  • Disease caused by Heterocheiloidea
  • Drug-induced enteritis of intestine
  • Duodenitis
  • Duodenitis caused by Ancylostoma
  • Duodenitis caused by chemical
  • Duodenitis caused by Cytomegalovirus
  • Duodenitis caused by drug
  • Duodenitis caused by ethanol
  • Duodenitis caused by Helicobacter pylori
  • Duodenitis caused by ionizing radiation
  • Duodenitis caused by Tropheryma whipplei
  • Duodenitis due to celiac disease
  • Duodenitis due to immunoglobulin A vasculitis
  • Duodenitis due to vasculitis
  • Eosinophilic duodenitis
  • Eosinophilic enteritis of small intestine
  • Gastrointestinal infection caused by non-tuberculous Mycobacterium
  • Granulomatous duodenitis
  • Infection by Anisakidae
  • Infection caused by Tropheryma
  • Infective duodenitis
  • Inflammation of ampulla of Vater
  • Lymphocytic duodenitis
  • Malabsorption caused by infective agent
  • Mycobacterial duodenitis
  • Mycobacterial enteritis of small intestine
  • Non-tuberculous mycobacterial duodenitis
  • Non-tuberculous mycobacterial enteritis of intestine
  • Non-tuberculous mycobacterial enteritis of small intestine
  • Parasitic duodenitis
  • Parasitic infection causing inflammation of small intestine
  • Parasitic infection of duodenum caused by Anisakis
  • Radiation induced enteritis of small intestine
  • Sarcoid duodenitis
  • Toxic enteritis of small intestine caused by drug
  • Viral duodenitis
  • Whipple's disease

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.

    • Duodenitis(nonspecific) (peptic)
    • Inflammation, inflamed, inflammatory(with exudation)
      • duodenum

Clinical ClassificationClinical

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

CCSR DIG007
Gastritis and duodenitis
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Ancylostomiasis

    infection of humans or animals with hookworms of the genus ancylostoma. characteristics include anemia, dyspepsia, eosinophilia, and abdominal swelling.

  • Duodenitis

    inflammation of the duodenum section of the small intestine (intestine, small). erosive duodenitis may cause bleeding in the upper gi tract and peptic ulcer.

  • Ancylostoma

    a genus of nematode intestinal parasites that consists of several species. a. duodenale is the common hookworm in humans. a. braziliense, a. ceylonicum, and a. caninum occur primarily in cats and dogs, but all have been known to occur in humans.

  • Ancylostomiasis

    infection by hookworms of the genus ancylostoma.

  • Ancylostomiasis due to Ancylostoma Braziliense

    infection by ancylostoma braziliense.

  • Ancylostomiasis due to Ancylostoma Ceylanicum

    infection by ancylostoma ceylanicum.

  • Ancylostomiasis due to Ancylostoma Duodenale

    ancylostomiasis that is caused by infection by ancylostoma duodenale.

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 K29.80 to ICD-9-CMHistory

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

ICD-9-CM
535.60 Duodenitis 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 K29.80Overview

Is K29.80 (Duodenitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report duodenitis without bleeding on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K29.80 group to?

When duodenitis 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 K29.80?

Under the General Equivalence Mappings, duodenitis without bleeding converts to ICD-9-CM 535.60 (duodenitis 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.