ICD-10 Code J01.21 – Acute recurrent ethmoidal sinusitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J01.21 – Acute recurrent ethmoidal sinusitis
What it is
J01.21 identifies an acute infection and inflammation of the ethmoid sinus that recurs in separate episodes. Use it when the record specifically describes recurrent acute ethmoidal sinusitis, not a chronic sinus condition.
Clinical signs
Typical findings include facial pressure or pain near the bridge of the nose, nasal congestion, and purulent nasal drainage. Clinical features vary; refer to documentation for evidence that the ethmoid sinus is involved and that the episode is acute and recurrent.
When to use this code
Assign this code when the provider documents acute recurrent ethmoidal sinusitis, or clearly describes repeated acute flare-ups affecting the ethmoid sinus. Use the code only when the recurrence is stated or can be supported by the note. If the site or acuity is unclear, check documentation.
Do not use for
Do not use J01.21 for chronic ethmoid sinusitis, unspecified sinusitis, or a single acute episode without recurrence. Do not assume ethmoid involvement unless the documentation supports it.
Coding tip
Confirm both elements: acute recurrence and ethmoid location, because either missing detail may require a different sinusitis code.