2026 ICD-10-CM Diagnosis Code J68.4Chronic respiratory conditions due to chemicals, gases, fumes and vapors

ICD-10-CM Codes›J00–J99›J60-J70›J68

ICD-10-CM J68.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J68.4 is a billable ICD-10-CM diagnosis code for chronic respiratory conditions due to chemicals, gases, fumes and vapors. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 190 through 192. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Lung disease due to external agents.

Code Identity

ICD-10-CM Code
J68.4
Billable Status
Yes — Valid for Submission
Code Describes
Chronic respiratory conditions due to chemicals, gases, fumes and vapors
Short Description
Chronic resp cond due to chemicals, gases, fumes and vapors
Parent Code
J68
Respiratory conditions due to inhalation of chemicals, gases, fumes and vapors

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ60-J70Lung diseases due to external agents
CategoryJ68Respiratory conditions due to inhalation of chemicals, gases, fumes and vapors
This CodeJ68.4Chronic respiratory conditions due to chemicals, gases, fumes and vapors

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic bronchiolitis
  • Chronic chemical respiratory disease
  • Chronic emphysema caused by chemical fumes
  • Chronic emphysema caused by vapor
  • Chronic fibrosis of lung
  • Chronic obliterative bronchiolitis
  • Chronic obliterative bronchiolitis caused by chemical fumes
  • Chronic obliterative bronchiolitis caused by vapor
  • Chronic pulmonary fibrosis caused by chemical fumes
  • Chronic pulmonary fibrosis caused by vapor
  • Chronic respiratory condition caused by fumes
  • Chronic respiratory condition caused by vapor
  • Drug-induced bronchiolitis obliterans
  • Interstitial pulmonary fibrosis due to inhalation of substance
  • Respiratory condition caused by vapor
  • Subacute obliterative bronchiolitis
  • Subacute obliterative bronchiolitis caused by chemical fumes
  • Subacute obliterative bronchiolitis caused by vapor
  • Toxic bronchiolitis obliterans
  • Toxic emphysema

Tabular List NotesGuidance

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

Code Also

  • , if applicable, chronic conditions, such as:
  • emphysema J43
  • obliterative bronchiolitis J44.81
  • pulmonary fibrosis J84.10

Type 1 Excludes

  • chronic pulmonary edema due to chemicals, gases, fumes and vapors J68.1

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.

    • Bronchiolitis(acute) (infective) (subacute)
      • chemical (chronic)
    • Bronchitis(diffuse) (fibrinous) (hypostatic) (infective) (membranous)
      • chemical (acute) (subacute)
        • due to fumes or vapors
          • chronic
    • Disease, diseased
      • respiratory (tract)
        • chronic NOS
          • due to
            • chemicals, gases, fumes or vapors
    • Disease, diseased
      • respiratory (tract)
        • due to
          • chemicals, gases, fumes or vapors
            • chronic

Clinical ClassificationClinical

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

CCSR RSP013
Lung disease due to external agents
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 J68.4 to ICD-9-CMHistory

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

ICD-9-CM
506.4 Fum/vapor chr resp cond
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 J68.4Overview

Is J68.4 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report chronic respiratory conditions due to chemicals, gases, fumes and vapors on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does J68.4 group to?

When chronic respiratory conditions due to chemicals, gases, fumes and vapors is the principal diagnosis on an inpatient stay, it groups to MS-DRG 190, 191, 192, with relative weights from 0.6420 to 1.1077 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of J68.4?

Under the General Equivalence Mappings, chronic respiratory conditions due to chemicals, gases, fumes and vapors converts to ICD-9-CM 506.4 (fum/vapor chr resp cond). 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.