2026 ICD-10-CM Diagnosis Code K22.9Disease of esophagus, unspecified

ICD-10-CM Codes›K00–K95›K20-K31›K22

ICD-10-CM K22.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K22.9 is a billable ICD-10-CM diagnosis code for disease of esophagus, unspecified. 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 benign mucous membrane pemphigoid. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Esophageal disorders.

Code Identity

ICD-10-CM Code
K22.9
Billable Status
Yes — Valid for Submission
Code Describes
Disease of esophagus, unspecified
Short Description
Disease of esophagus, unspecified
Same as the full description in the CMS dataset.
Parent Code
K22
Other diseases of esophagus

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK22Other diseases of esophagus
This CodeK22.9Disease of esophagus, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Benign mucous membrane pemphigoid
  • Disorder of esophagus
  • Disorder of upper esophageal sphincter
  • Mucous membrane pemphigoid with esophageal involvement

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.

    • Disease, diseased
      • esophagus
    • Disorder(of)
      • esophagus

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

  • Benign Mucous Membrane Pemphigoid

    a chronic autoimmune disorder characterized by the development of blisters and ulcers in mucous membranes. it affects most often the gums, eyelids and genital mucosa sites.

Patient EducationClinical

Esophagus Disorders

The esophagus is the muscular tube that carries food and liquids from your mouth to the stomach. You may not be aware of your esophagus until you swallow something too large, too hot, or too cold. You may also notice it when something is wrong. You may feel pain or have trouble swallowing.

Read the full article at MedlinePlus

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

Convert K22.9 to ICD-9-CMHistory

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

ICD-9-CM
530.9 Esophageal disorder NOS
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 K22.9Overview

Is K22.9 (Other diseases of esophagus) a billable code?

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

What MS-DRG does K22.9 group to?

When disease of esophagus, unspecified 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 K22.9?

Under the General Equivalence Mappings, disease of esophagus, unspecified converts to ICD-9-CM 530.9 (esophageal disorder NOS). 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.