2026 ICD-10-CM Diagnosis Code J82.82Acute eosinophilic pneumonia

ICD-10-CM Codes›J00–J99›J80-J84›J82

ICD-10-CM J82.82
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J82.82 is a billable ICD-10-CM diagnosis code for acute eosinophilic pneumonia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 196 through 198. Coders also document this condition as idiopathic acute eosinophilic pneumonitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified lower respiratory disease.

Code Identity

ICD-10-CM Code
J82.82
Billable Status
Yes — Valid for Submission
Code Describes
Acute eosinophilic pneumonia
Short Description
Acute eosinophilic pneumonia
Same as the full description in the CMS dataset.
Parent Code
J82.8
Pulmonary eosinophilia, not elsewhere classified

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ80-J84Other respiratory diseases principally affecting the interstitium
CategoryJ82Pulmonary eosinophilia, not elsewhere classified
This CodeJ82.82Acute eosinophilic pneumonia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Idiopathic acute eosinophilic pneumonitis
  • Idiopathic eosinophilic pneumonitis

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.

    • Eosinophilia(allergic) (idiopathic) (secondary)
      • pulmonary NEC
        • acute
    • Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
      • eosinophilic
        • acute
    • Pneumonitis(acute) (primary)
      • eosinophilic
        • acute

Clinical ClassificationClinical

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

CCSR RSP016
Other specified and unspecified lower respiratory disease
Default principal diagnosis: inpatient Yes · outpatient Yes

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.

Code History & ChangesHistory

Replacement J82.82 replaces the following previously assigned code(s):

  • J82 - Pulmonary eosinophilia, not elsewhere classified
FY 2021AddedAdded to the ICD-10-CM code setEffective October 1, 2020.
FY 2022–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About J82.82Overview

Is J82.82 (Pulmonary eosinophilia, not elsewhere classified) a billable code?

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

What MS-DRG does J82.82 group to?

When acute eosinophilic pneumonia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 196, 197, 198, with relative weights from 0.7162 to 1.8872 depending on complications. Higher weights mean higher Medicare reimbursement.

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.