2026 ICD-10-CM Diagnosis Code J84.112Idiopathic pulmonary fibrosis

ICD-10-CM Codes›J00–J99›J80-J84›J84

ICD-10-CM J84.112
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J84.112 is a billable ICD-10-CM diagnosis code for idiopathic pulmonary fibrosis. 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 acute exacerbation of idiopathic pulmonary fibrosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified lower respiratory disease.

Code Identity

ICD-10-CM Code
J84.112
Billable Status
Yes — Valid for Submission
Code Describes
Idiopathic pulmonary fibrosis
Short Description
Idiopathic pulmonary fibrosis
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 CodeJ84.112Idiopathic pulmonary fibrosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute exacerbation of idiopathic pulmonary fibrosis
  • Chronic interstitial pneumonitis
  • Familial idiopathic pulmonary fibrosis
  • Idiopathic interstitial pneumonitis
  • Idiopathic pleuroparenchymal fibroelastosis
  • Idiopathic pulmonary fibrosis
  • Prolonged pulmonary alveolitis

Tabular List NotesGuidance

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

Inclusion Terms

  • Cryptogenic fibrosing alveolitis
  • Idiopathic fibrosing alveolitis

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.

    • Alveolitis
      • fibrosing (cryptogenic) (idiopathic)
    • Fibrosis, fibrotic
      • lung (atrophic) (chronic) (confluent) (massive) (perialveolar) (peribronchial)
        • idiopathic
    • Fibrosis, fibrotic
      • pulmonary
        • idiopathic
    • Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
      • interstitial
        • usual
    • Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
      • interstitial
        • usual
          • 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

Clinical InformationClinical

  • Idiopathic Pulmonary Fibrosis

    a common interstitial lung disease of unknown etiology, usually occurring between 50-70 years of age. clinically, it is characterized by an insidious onset of breathlessness with exertion and a nonproductive cough, leading to progressive dyspnea. pathological features show scant interstitial inflammation, patchy collagen fibrosis, prominent fibroblast proliferation foci, and microscopic honeycomb change.

  • Dyspnea

    difficult or labored breathing.

Patient EducationClinical

Pulmonary Fibrosis

Pulmonary fibrosis is a condition in which the tissue deep in your lungs becomes scarred over time. This tissue gets thick and stiff. That makes it hard for you to catch your breath, and your blood may not get enough oxygen.

Read the full article at MedlinePlus

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

Convert J84.112 to ICD-9-CMHistory

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

ICD-9-CM
516.31 Idiopath pulmon fibrosis
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 J84.112Overview

Is J84.112 (Idiopathic interstitial pneumonia) a billable code?

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

What MS-DRG does J84.112 group to?

When idiopathic pulmonary fibrosis 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 J84.112?

Under the General Equivalence Mappings, idiopathic pulmonary fibrosis converts to ICD-9-CM 516.31 (idiopath pulmon fibrosis). 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.