ICD-10 Code H66.40 – Suppurative otitis media, unspecified, unspecified ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H66.40 – Suppurative otitis media, unspecified, unspecified ear
What it is
This code identifies a suppurative middle ear infection when the ear is not specified and the record does not name a more precise type. Use it for documented purulent otitis media without laterality detail.
Clinical signs
Typical findings include ear pain, fever, drainage if the tympanic membrane is perforated, and a red or bulging eardrum. Clinical features vary; refer to documentation.
When to use this code
Use H66.40 when the provider documents suppurative otitis media but does not identify the right or left ear. It also fits when the note confirms infection of the middle ear with pus, but laterality is unavailable or not recorded. If the chart gives a more specific ear or subtype, code that instead.
Do not use for
Do not use this code for nonsuppurative otitis media, otitis externa, or chronic mastoid disease. Check documentation if the record specifies a different ear or a more exact diagnosis.
Coding tip
Always look for laterality and chronicity in the provider note before choosing this unspecified code.