ICD-10 Code J63.4 – Siderosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J63.4 – Siderosis
What it is
Siderosis is a lung disease caused by inhaling iron dust or fumes over time. It is an occupational condition and reflects iron deposition in the lungs rather than infection.
Clinical signs
Clinical features vary; refer to documentation. Patients may have chronic cough, shortness of breath, or an abnormal chest imaging finding after long-term iron exposure.
When to use this code
Use J63.4 when the record clearly documents siderosis from inhaled iron particles or fumes. Code it for work-related lung disease when the clinician identifies siderosis by name or describes iron dust deposition in the lungs.
Confirm that the condition is current and not simply a past exposure history. If the note only says “exposed to iron,” check documentation before assigning this diagnosis.
Do not use for
Do not use this code for general iron overload, anemia, or nonoccupational lung scarring. It is also not for vague exposure history without a documented diagnosis.
Coding tip
Look for wording such as “pulmonary siderosis,” “iron dust lung,” or similar occupational documentation before coding J63.4.