ICD-10 Code J66.0 – Byssinosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J66.0 – Byssinosis
What it is
Byssinosis is an occupational lung disease caused by inhaling cotton, flax, or hemp dust. It is a form of airway irritation and obstruction linked to textile work exposure.
Clinical signs
Typical features include chest tightness, cough, and shortness of breath, often worse on the first day back at work after time away. Clinical features vary; refer to documentation.
When to use this code
Use J66.0 when the record clearly identifies byssinosis or “brown lung” due to textile dust exposure. Code it when the clinician documents a work-related dust lung disease tied to cotton, flax, or hemp exposure. Check documentation if the exposure source is unclear.
Do not use for
Do not use this code for nonspecific asthma, bronchitis, or cough without documented byssinosis. Do not assume it for any occupational dust exposure unless the record supports this exact diagnosis.
Coding tip
Confirm both the diagnosis and the specific dust exposure in the note before assigning J66.0.