ICD-10 Code J20.4 – Acute bronchitis due to parainfluenza virus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J20.4 – Acute bronchitis due to parainfluenza virus
What it is
J20.4 identifies acute bronchitis caused by parainfluenza virus. Use it when the provider documents bronchitis with a confirmed or clearly stated parainfluenza viral cause.
Clinical signs
Typical findings include acute cough, mucus production, and chest discomfort, often with other viral respiratory symptoms. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record links acute bronchitis to parainfluenza virus, such as “parainfluenza bronchitis” or “acute bronchitis due to parainfluenza.” If the note only says bronchitis without an organism, check documentation before assigning J20.4. Code the documented etiology, not a suspected one.
Do not use for
Do not use J20.4 for chronic bronchitis, bronchiolitis, or bronchitis caused by another organism. If the causative virus is not documented, check documentation.
Coding tip
Assign J20.4 only when parainfluenza is explicitly documented as the cause of the acute bronchitis.