2026 ICD-10-CM Diagnosis Code J66.1Flax-dressers' disease
ICD-10-CM Codes›J00–J99›J60-J70›J66
- Billable — Valid for Submission
- Chronic Condition
J66.1 is a billable ICD-10-CM diagnosis code for Flax-dressers' disease. 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 byssinosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Lung disease due to external agents.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Byssinosis
- Endotoxicosis
- Flax-dressers' disease
- Pneumoconiosis caused by organic dust
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Disease, diseased - See Also: Syndrome;
- flax-dresser's - J66.1
- Flax-dresser's disease - J66.1
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Disease, diseased
- flax-dresser's
- Flax-dresser's disease
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 J66.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About J66.1Overview
Is J66.1 (Airway disease due to specific organic dust) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report Flax-dressers' disease on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does J66.1 group to?
When Flax-dressers' disease 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 J66.1?
Under the General Equivalence Mappings, Flax-dressers' disease 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.
