2026 ICD-10-CM Diagnosis Code J98.4Other disorders of lung

ICD-10-CM Codes›J00–J99›J96-J99›J98

ICD-10-CM J98.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J98.4 is a billable ICD-10-CM diagnosis code for other disorders of lung. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 205 through 206. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified lower respiratory disease.

Code Identity

ICD-10-CM Code
J98.4
Billable Status
Yes — Valid for Submission
Code Describes
Other disorders of lung
Short Description
Other disorders of lung
Same as the full description in the CMS dataset.
Parent Code
J98
Other respiratory disorders

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ96-J99Other diseases of the respiratory system
CategoryJ98Other respiratory disorders
This CodeJ98.4Other disorders of lung

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired bronchogenic cyst
  • Bulla of lung
  • Calcification of lung
  • Cavitation of lung
  • Chronic cavitary pulmonary aspergillosis
  • Chronic lung disease
  • Chronic lung disease due to surfactant disorder
  • Chronic pulmonary aspergillosis
  • Cystic-bullous disease of the lung
  • Diffuse pulmonary calcinosis
  • Discoloration of lung
  • Disorder of lung
  • Disorder of lung due to immunoglobulin A vasculitis
  • Erythrocytosis due to pulmonary disease
  • Erythrocytosis due to tissue hypoxemia
  • FEV1/FVC ratio abnormal
  • Hemosiderosis
  • Idiopathic diffuse pulmonary ossification
  • Infected bronchogenic cyst
  • Infection by Pneumocystis jirovecii
  • Infection of lung caused by Pneumocystis
  • Lung cyst
  • Lung disease due to connective tissue disorder
  • Lung disorder due to autoimmune disorder
  • Lung function mildly obstructed
  • Lymphocytic pseudotumor of lung
  • Micronodular pulmonary ossification
  • Milk-induced pulmonary disease in infant
  • Multiple cysts of pulmonary system
  • Multiple lung cysts
  • Multiple nodules of lung
  • Non-smoker's second hand smoke syndrome
  • Occupational lung disease
  • Pneumocystis jirovecii lung cyst
  • Pneumocystosis
  • Pulmolithiasis
  • Pulmonary aspergillosis
  • Pulmonary cavity following infection by Coccidioides
  • Pulmonary hyalinizing granuloma
  • Pulmonary hypertension due to lung disease and/or hypoxia
  • Pulmonary nodular lymphoid hyperplasia
  • Pulmonary ossification
  • Pulmonary toxicity
  • Restrictive lung disease
  • Restrictive lung disease due to kyphoscoliosis
  • Restrictive lung disease due to muscular dystrophy
  • Right ventricular failure due to pulmonary disease
  • Right ventricular failure due to pulmonary vascular disease
  • Secondary hemosiderosis
  • Secondary pulmonary hemosiderosis
  • Smoker's respiratory syndrome
  • Squamous metaplasia of lung
  • Uremic lung

Tabular List NotesGuidance

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

Inclusion Terms

  • Calcification of lung
  • Cystic lung disease (acquired)
  • Lung disease NOS
  • Pulmolithiasis

Type 1 Excludes

  • acute interstitial pneumonitis J84.114
  • pulmonary insufficiency following surgery J95.1 J95.2

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.

    • Adhesions, adhesive(postinfective)
      • lung
    • Adhesions, adhesive(postinfective)
      • pulmonary
    • Atrophy, atrophic(of)
      • lung (senile)
    • Calcification
      • lung (active) (postinfectional)
    • Calculus, calculi, calculous
      • lung
    • Calculus, calculi, calculous
      • pulmonary
    • Cavitation of lung
      • nontuberculous
    • Cicatrix(adherent) (contracted) (painful) (vicious)
      • lung
    • Compression
      • lung
    • Cyst(colloid) (mucous) (simple) (retention)
      • air, lung
    • Cyst(colloid) (mucous) (simple) (retention)
      • bronchogenic (mediastinal) (sequestration)
    • Cyst(colloid) (mucous) (simple) (retention)
      • lung
    • Cystic
      • lung disease
    • Deformity
      • lung (congenital)
        • acquired
    • Degeneration, degenerative
      • lung
    • Density
      • lung (nodular)
    • Disease, diseased
      • bronchopulmonary
    • Disease, diseased
      • cystic
        • lung
    • Disease, diseased
      • lung
    • Disease, diseased
      • lung
        • cystic
    • Disease, diseased
      • lung
        • polycystic
    • Disease, diseased
      • polycystic
        • lung or pulmonary
    • Hernia, hernial(acquired) (recurrent)
      • lung (subcutaneous)
    • Honeycomb lung
    • Inflammation, inflamed, inflammatory(with exudation)
      • lung (acute)
        • chronic
    • Insufficiency, insufficient
      • pulmonary
    • Insufficiency, insufficient
      • pulmonary
        • following
          • shock
    • Insufficiency, insufficient
      • pulmonary
        • following
          • trauma
    • Lesion(s) (nontraumatic)
      • pulmonary
    • Obstruction, obstructed, obstructive
      • lung
    • Occlusion, occluded
      • lung
    • Paralysis, paralytic(complete) (incomplete)
      • lung
    • Pneumatocele(lung)
    • Pneumonitis(acute) (primary)
    • Pneumonitis(acute) (primary)
      • noninfectious
    • Pneumonitis(acute) (primary)
      • specified NEC
    • Pneumopathy NEC
    • Polycystic(disease)
      • lung
    • Pseudocyst
      • lung
    • Pulmolithiasis
    • Retraction
      • lung
    • Scar, scarring
      • lung (base)
    • Ulcer, ulcerated, ulcerating, ulceration, ulcerative
      • lung

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

  • Hemosiderosis

    conditions in which there is a generalized increase in the iron stores of body tissues, particularly of liver and the mononuclear phagocyte system, without demonstrable tissue damage. the name refers to the presence of stainable iron in the tissue in the form of hemosiderin.

  • Hemosiderosis, Pulmonary

    iron deposition within the lung. primary pulmonary hemosiderosis is characterized by hemoptysis; iron-deficiency anemia, and diffuse pulmonary hemorrhage as seen as transient pulmonary infiltrates on radiography. even though large amounts of iron are laid down in the lung, with normal or increased total body iron, anemia occurs because of inability of the erythron to use iron sequestered in pulmonary macrophages.

  • Invasive Pulmonary Aspergillosis

    lung infections with the invasive forms of aspergillus, usually after surgery, transplantation, prolonged neutropenia or treatment with high-doses of corticosteroids. invasive pulmonary aspergillosis can progress to chronic necrotizing pulmonary aspergillosis or hematogenous spread to other organs.

  • Pulmonary Aspergillosis

    infections of the respiratory tract with fungi of the genus aspergillus.

  • Mononuclear Phagocyte System

    mononuclear cells with pronounced phagocytic ability that are distributed extensively in lymphoid and other organs. it includes macrophages and their precursors; phagocytes; kupffer cells; histiocytes; dendritic cells; langerhans cells; and microglia. the term mononuclear phagocyte system has replaced the former reticuloendothelial system, which also included less active phagocytic cells such as fibroblasts and endothelial cells. (from illustrated dictionary of immunology, 2d ed.)

  • Aspergillus

    a genus of mitosporic fungi containing about 100 species and eleven different teleomorphs in the family trichocomaceae.

  • Restrictive Lung Disease

    decreased lung volume and inadequate ventilation due to parenchymal lung disorders (e.g., interstitial pulmonary fibrosis) or extrapulmonary disorders (e.g., scoliosis). patients present with shortness of breath and cough.

  • Chronic Pulmonary Aspergillosis

    a spectrum of disorders associated with long-term aspergillus infection of the lung that usually occur in immunocompetent individuals with underlying respiratory disorders, and may be characterized by pulmonary fibrosis or cavitation.

  • Pulmonary Toxicity

    toxicity that impairs or damages the lung(s). this condition is often caused by the administration of a pharmaceutical agent that causes damage to the lungs.

Patient EducationClinical

Lung Diseases

When you breathe, your lungs take in oxygen from the air and deliver it to the bloodstream. The cells in your body need oxygen to work and grow. During a normal day, you breathe nearly 25,000 times. People with lung disease have difficulty breathing. Millions of people in the U.S. have lung disease.

Read the full article at MedlinePlus

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

Convert J98.4 to ICD-9-CMHistory

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

ICD-9-CM
518.89 Other lung disease NEC
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 J98.4Overview

Is J98.4 (Other respiratory disorders) a billable code?

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

What MS-DRG does J98.4 group to?

When other disorders of lung is the principal diagnosis on an inpatient stay, it groups to MS-DRG 205, 206, with relative weights from 0.9411 to 1.8310 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of J98.4?

Under the General Equivalence Mappings, other disorders of lung converts to ICD-9-CM 518.89 (other lung disease NEC). 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.