ICD-10 Code B44.9 – Aspergillosis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B44.9 – Aspergillosis, unspecified
What it is
B44.9 identifies aspergillosis when the record confirms Aspergillus infection but does not specify the site or clinical form. Use it for an unspecified fungal disease caused by Aspergillus species.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings may include respiratory symptoms, fever, or imaging abnormalities, but the chart must support aspergillosis rather than another fungal process.
When to use this code
Use B44.9 when the clinician documents aspergillosis without naming a type such as pulmonary, allergic, or disseminated disease. It also fits when the note confirms Aspergillus infection but the available record does not specify the exact manifestation.
Do not use for
Do not use this code if the documentation identifies a specific aspergillosis subtype; code the more detailed option instead. Also avoid it when Aspergillus is only suspected or when another fungal diagnosis is recorded.
Coding tip
Check the provider’s final diagnosis and any pathology or imaging notes before assigning this unspecified code.