ICD-10 Code J94.1 – Fibrothorax (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J94.1 – Fibrothorax
What it is
Fibrothorax is a condition where fibrous scar tissue thickens the pleural space and can restrict lung expansion. It usually reflects chronic pleural disease rather than a primary lung infection.
Clinical signs
Common findings include reduced chest expansion, decreased breath sounds, and restrictive breathing pattern. Imaging may show pleural thickening or trapped lung; clinical features vary, so refer to documentation.
When to use this code
Use J94.1 when the provider documents fibrothorax or pleural fibrosis causing mechanical restriction of the lung. It may apply after chronic pleural inflammation, hemothorax, or empyema if that is the stated diagnosis. Code the documented condition as written and confirm laterality or cause if reported.
Do not use for
Do not use this code for simple pleural effusion, pneumothorax, or acute pleurisy without fibrotic pleural scarring. If the record only mentions pleural thickening, check documentation.
Coding tip
Query for the underlying pleural cause when fibrothorax is documented, because the etiology may need separate coding.