2026 ICD-10-CM Diagnosis Code K20.0Eosinophilic esophagitis

ICD-10-CM Codes›K00–K95›K20-K31›K20

ICD-10-CM K20.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K20.0 is a billable ICD-10-CM diagnosis code for eosinophilic esophagitis. 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. Coders also document this condition as chronic esophagitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Esophageal disorders.

Code Identity

ICD-10-CM Code
K20.0
Billable Status
Yes — Valid for Submission
Code Describes
Eosinophilic esophagitis
Short Description
Eosinophilic esophagitis
Same as the full description in the CMS dataset.
Parent Code
K20
Esophagitis

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK20Esophagitis
This CodeK20.0Eosinophilic esophagitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic esophagitis
  • Eosinophilic esophagitis
  • Eosinophilic esophagitis caused by food
  • Neonatal eosinophilic esophagitis
  • Neonatal esophagitis
  • Proton pump inhibitor responsive eosinophilic esophagitis

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.

    • Esophagitis(acute) (alkaline) (chemical) (chronic) (infectional) (necrotic) (peptic) (postoperative) (without bleeding)
      • eosinophilic

Clinical ClassificationClinical

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

CCSR DIG004
Esophageal disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Eosinophilic Esophagitis

    chronic esophagitis characterized by esophageal mucosal eosinophilia. it is diagnosed when an increase in eosinophils are present over the entire esophagus. the reflux symptoms fail to respond to proton pump inhibitors treatment, unlike in gastroesophageal reflux disease. the symptoms are associated with ige-mediated hypersensitivity to food or inhalant allergens.

  • Chronic Esophagitis

    a chronic inflammatory process affecting the esophageal wall.

Patient EducationClinical

Eosinophilic Esophagitis

Eosinophilic esophagitis (EoE) is a chronic disease of the esophagus. Your esophagus is the muscular tube that carries food and liquids from your mouth to the stomach. If you have EoE, white blood cells called eosinophils build up in your esophagus.

The full article covers:

  • What is eosinophilic esophagitis (EoE)?
  • What causes eosinophilic esophagitis (EoE)?
  • Who is at risk for eosinophilic esophagitis(EoE)?
  • What are the symptoms of eosinophilic esophagitis (EoE)?
  • How is eosinophilic esophagitis (EoE) diagnosed?
  • What are the treatments for eosinophilic esophagitis (EoE)?

Read the full article at MedlinePlus

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

Convert K20.0 to ICD-9-CMHistory

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

ICD-9-CM
530.13 Eosinophilic esophagitis
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 K20.0Overview

Is K20.0 (Esophagitis) a billable code?

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

What MS-DRG does K20.0 group to?

When eosinophilic esophagitis 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 K20.0?

Under the General Equivalence Mappings, eosinophilic esophagitis converts to ICD-9-CM 530.13 (eosinophilic esophagitis). The mapping is a direct match.

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.