ICD-10 Code B46.0 – Pulmonary mucormycosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B46.0 – Pulmonary mucormycosis
What it is
B46.0 identifies mucormycosis involving the lungs. It is a serious invasive fungal infection caused by Mucorales organisms that affects pulmonary tissue.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include fever, cough, chest pain, shortness of breath, and radiographic evidence of pulmonary infection or necrosis.
When to use this code
Use B46.0 when the provider documents pulmonary mucormycosis, mucormycosis of the lung, or invasive fungal infection limited to the lungs. Code it when the diagnosis is confirmed or clearly stated in the record. If the site is not specified, check documentation before assigning this code.
Do not use for
Do not use this code for other fungal pneumonias, aspergillosis, or mucormycosis at a different anatomic site. If the record only says suspected fungal infection, check documentation.
Coding tip
Confirm that the pulmonary site and mucormycosis are both documented before assigning B46.0.