2026 ICD-10-CM Diagnosis Code J84.114Acute interstitial pneumonitis

ICD-10-CM Codes›J00–J99›J80-J84›J84

ICD-10-CM J84.114
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J84.114 is a billable ICD-10-CM diagnosis code for acute interstitial pneumonitis. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified lower respiratory disease.

Code Identity

ICD-10-CM Code
J84.114
Billable Status
Yes — Valid for Submission
Code Describes
Acute interstitial pneumonitis
Short Description
Acute interstitial pneumonitis
Same as the full description in the CMS dataset.
Parent Code
J84.11
Idiopathic interstitial pneumonia

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ80-J84Other respiratory diseases principally affecting the interstitium
CategoryJ84Other interstitial pulmonary diseases
This CodeJ84.114Acute interstitial pneumonitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute interstitial pneumonitis
  • Idiopathic interstitial pneumonitis

Tabular List NotesGuidance

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

Inclusion Terms

  • Hamman-Rich syndrome

Type 1 Excludes

  • pneumocystis pneumonia B59

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.

    • Fibrosis, fibrotic
      • lung (atrophic) (chronic) (confluent) (massive) (perialveolar) (peribronchial)
        • diffuse (idiopathic)
          • interstitial
            • acute
    • Hamman-Rich syndrome
    • Pneumonitis(acute) (primary)
      • interstitial (chronic)
        • acute
    • Syndrome
      • acute respiratory distress (adult) (child)
        • idiopathic
    • Syndrome
      • respiratory
        • distress
          • acute
            • idiopathic

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

Interstitial Lung Diseases

Interstitial lung disease is the name for a large group of diseases that inflame or scar the lungs. The inflammation and scarring make it hard to get enough oxygen. The scarring is called pulmonary fibrosis.

Read the full article at MedlinePlus

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

Convert J84.114 to ICD-9-CMHistory

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

ICD-9-CM
516.33 Acute interstitial pneum
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 J84.114Overview

Is J84.114 (Idiopathic interstitial pneumonia) a billable code?

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

What MS-DRG does J84.114 group to?

When acute interstitial pneumonitis 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.

What is the ICD-9 equivalent of J84.114?

Under the General Equivalence Mappings, acute interstitial pneumonitis converts to ICD-9-CM 516.33 (acute interstitial pneum). 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.