2026 ICD-10-CM Diagnosis Code K52.81Eosinophilic gastritis or gastroenteritis

ICD-10-CM Codes›K00–K95›K50-K52›K52

ICD-10-CM K52.81
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K52.81 is a billable ICD-10-CM diagnosis code for eosinophilic gastritis or gastroenteritis. 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 Noninfectious gastroenteritis.

Code Identity

ICD-10-CM Code
K52.81
Billable Status
Yes — Valid for Submission
Code Describes
Eosinophilic gastritis or gastroenteritis
Short Description
Eosinophilic gastritis or gastroenteritis
Same as the full description in the CMS dataset.
Parent Code
K52.8
Other specified noninfective gastroenteritis and colitis

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK50-K52Noninfective enteritis and colitis
CategoryK52Other and unspecified noninfective gastroenteritis and colitis
This CodeK52.81Eosinophilic gastritis or gastroenteritis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Allergic enteritis of small intestine
  • Allergic gastritis
  • Allergic gastroenteritis
  • Eosinophilic enteritis of intestine
  • Eosinophilic enteritis of small intestine
  • Eosinophilic gastritis
  • Eosinophilic gastroenteritis
  • Eosinophilic gastroenteropathy with collagen vascular disease
  • Eosinophilic gastroenteropathy with food sensitivity
  • Eosinophilic gastroenteropathy with predominant mucosal disease
  • Eosinophilic gastroenteropathy with predominant muscle layer disease
  • Eosinophilic gastroenteropathy with predominant subserosal disease
  • Gastric hemorrhage due to allergic gastritis
  • Gastric hemorrhage due to eosinophilic gastritis
  • Ulcer of stomach due to eosinophilic gastritis

Tabular List NotesGuidance

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

Inclusion Terms

  • Eosinophilic enteritis

Type 2 Excludes

  • eosinophilic esophagitis K20.0

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.

    • Enteritis(acute) (diarrheal) (hemorrhagic) (noninfective)
      • allergic
        • with
          • eosinophilic gastritis or gastroenteritis
    • Enteritis(acute) (diarrheal) (hemorrhagic) (noninfective)
      • eosinophilic
    • Gastritis(simple)
      • eosinophilic
    • Gastroenteritis(acute) (chronic) (noninfectious)
      • allergic
        • with
          • eosinophilic gastritis or gastroenteritis
    • Gastroenteritis(acute) (chronic) (noninfectious)
      • eosinophilic

Clinical ClassificationClinical

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

CCSR DIG022
Noninfectious gastroenteritis
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Eosinophilic Gastroenteritis

    gastroenteritis that is characterized by eosinophilic infiltration.

Patient EducationClinical

Eosinophilic Disorders

Eosinophils are a type of white blood cell. They help fight off infections and play a role in your body's immune response. They can also build up and cause inflammation.

Read the full article at MedlinePlus

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

Convert K52.81 to ICD-9-CMHistory

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

ICD-9-CM
535.70 Eosinophil gastrt wo hem
Approximate The match is approximate rather than exact.
ICD-9-CM
535.71 Eosinophilc gastrt w hem
Approximate The match is approximate rather than exact.
ICD-9-CM
558.41 Eosinophilic gastroent
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 K52.81Overview

Is K52.81 (Other specified noninfective gastroenteritis and colitis) a billable code?

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

What MS-DRG does K52.81 group to?

When eosinophilic gastritis or gastroenteritis 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 K52.81?

Under the General Equivalence Mappings, eosinophilic gastritis or gastroenteritis converts to ICD-9-CM 535.70 (eosinophil gastrt wo hem), 535.71 (eosinophilc gastrt w hem), and 558.41 (eosinophilic gastroent). The mapping is approximate, so confirm the match fits the documentation.

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.