ICD-10 Code H66.21 – Chronic atticoantral suppurative otitis media, right ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H66.21 – Chronic atticoantral suppurative otitis media, right ear
What it is
This code identifies chronic suppurative middle ear infection involving the atticoantral region of the right ear. Use it when documentation specifies a chronic atticoantral process with right-sided involvement.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings may include persistent ear discharge, recurrent infection, and evidence of chronic middle ear disease affecting the attic or antrum.
When to use this code
Use H66.21 when the provider documents chronic atticoantral suppurative otitis media in the right ear. It is appropriate for chronic disease notes, ENT assessments, or problem lists that clearly identify the right ear.
If the record only says chronic otitis media without atticoantral detail, check documentation before assigning this code. Code the laterality exactly as documented and avoid guessing from symptoms alone.
Do not use for
Do not use this code for acute otitis media, nonsuppurative otitis media, or unspecified chronic ear infection. Check documentation if the side is not stated or if the atticoantral type is not confirmed.
Coding tip
Verify both the chronic atticoantral wording and right-ear laterality in the note before coding H66.21.