ICD-10 Code J90 – Pleural effusion, not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J90 – Pleural effusion, not elsewhere classified
What it is
J90 identifies pleural effusion, meaning abnormal fluid has collected in the pleural space around a lung. Use it when the record documents the effusion but does not name a specific cause.
Clinical signs
Common findings include shortness of breath, pleuritic chest discomfort, and decreased breath sounds over the affected area. Clinical features vary; refer to documentation and imaging results.
When to use this code
Use J90 when the provider documents pleural effusion without linking it to another condition such as heart failure, infection, malignancy, or trauma. It also fits when imaging confirms an effusion and the cause remains unspecified. Code the underlying disorder first when it is known.
Do not use for
Do not use J90 if the effusion is documented as due to a specific disease or injury and that condition has its own code. Check documentation if the record instead describes empyema, hemothorax, or another pleural disorder.
Coding tip
Assign J90 only when the effusion is the documented diagnosis and no more specific etiology is stated.