2026 ICD-10-CM Diagnosis Code J66.0Byssinosis

ICD-10-CM Codes›J00–J99›J60-J70›J66

ICD-10-CM J66.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J66.0 is a billable ICD-10-CM diagnosis code for byssinosis. 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 Lung disease due to external agents.

Code Identity

ICD-10-CM Code
J66.0
Billable Status
Yes — Valid for Submission
Code Describes
Byssinosis
Short Description
Byssinosis
Same as the full description in the CMS dataset.
Parent Code
J66
Airway disease due to specific organic dust

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ60-J70Lung diseases due to external agents
CategoryJ66Airway disease due to specific organic dust
This CodeJ66.0Byssinosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Byssinosis
  • Byssinosis grade 3
  • Endotoxicosis
  • Pneumoconiosis caused by organic dust

Tabular List NotesGuidance

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

Inclusion Terms

  • Airway disease due to cotton dust

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.

    • Byssinosis
    • Disease, diseased
      • airway
        • obstructive, chronic
          • due to
            • cotton dust
    • Fibrosis, fibrotic
      • lung (atrophic) (chronic) (confluent) (massive) (perialveolar) (peribronchial)
        • with
          • byssinosis
    • Pneumoconiosis(due to) (inhalation of)
      • cotton dust

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

Clinical InformationClinical

  • Byssinosis

    a condition of bronchoconstriction resulting from hypersensitive reaction to inhaled dust during the initial processing of cotton, flax, or hemp in the textile industry. symptoms include wheezing and tightness in the chest.

  • Bronchoconstriction

    narrowing of the caliber of the bronchi, physiologically or as a result of pharmacological intervention.

  • Byssinosis

    an occupational lung disorder caused by exposure to cotton dust. it occurs more commonly in workers in the textile industry. signs and symptoms include chest tightness, cough and wheezing. the symptoms tend to get worse at the beginning of the week and subside by the end of the week.

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 J66.0 to ICD-9-CMHistory

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

ICD-9-CM
504 Dust pneumonopathy NEC
Approximate The match is approximate rather than exact.

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 J66.0Overview

Is J66.0 (Airway disease due to specific organic dust) a billable code?

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

What MS-DRG does J66.0 group to?

When byssinosis 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 J66.0?

Under the General Equivalence Mappings, byssinosis converts to ICD-9-CM 504 (dust pneumonopathy NEC). The mapping is approximate, so confirm the match fits the documentation.

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.