ICD-10 Code J01.0 – Acute maxillary sinusitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J01.0 – Acute maxillary sinusitis
What it is
J01.0 identifies an acute infection and inflammation of the maxillary sinus, the air-filled space in the cheek area. Use it when the record clearly states acute maxillary sinusitis.
Clinical signs
Typical findings include facial pain or pressure over the cheeks, nasal congestion, and purulent nasal discharge. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents acute maxillary sinusitis, whether the cause is bacterial, viral, or unspecified. It also fits when the note names maxillary sinus involvement without another more specific sinusitis code. If the record only says sinusitis, check documentation for the sinus location.
Do not use for
Do not use J01.0 for chronic maxillary sinusitis or for sinusitis limited to another sinus. Check documentation when the diagnosis is only rhinitis, a common cold, or nonspecific facial pain.
Coding tip
Code the most specific sinus site documented; if maxillary sinusitis is stated, J01.0 is the correct choice.