ICD-10 Code J86.9 – Pyothorax without fistula (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J86.9 – Pyothorax without fistula
What it is
J86.9 identifies pyothorax, also called empyema, when pus is present in the pleural space and no fistula is documented. Use this code when the record confirms a pleural empyema but does not specify a draining tract.
Clinical signs
Clinical features vary; refer to documentation. Commonly, patients have evidence of pleural infection on imaging or drainage findings, with pleural fluid described as purulent or infected.
When to use this code
Use J86.9 when the provider documents pyothorax or empyema and does not mention a bronchopleural, pleurocutaneous, or other fistula. It also fits cases where the pleural infection is recorded without further detail. If the chart specifies a fistula, code that documented condition instead.
Do not use for
Do not use this code for pleural effusion without infection, or when the record clearly identifies a fistula-related empyema. Check documentation if the provider uses only nonspecific pleural disease terms.
Coding tip
Confirm the absence of a fistula in the note before assigning J86.9.