ICD-10 Code H65.33 – Chronic mucoid otitis media, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H65.33 – Chronic mucoid otitis media, bilateral
What it is
H65.33 identifies chronic mucoid otitis media affecting both ears. It describes persistent middle-ear fluid that is thick or mucus-like, without using this code for acute infection.
Clinical signs
Typical findings include bilateral middle-ear effusion, a dull or retracted tympanic membrane, and reduced hearing. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly states chronic mucoid otitis media in both ears. It is appropriate for ongoing effusion documented as bilateral, especially when the provider distinguishes it from acute otitis media or other ear disease.
If laterality is documented as bilateral and the condition is chronic, this code is usually the best match. Check documentation if the note only says otitis media with effusion or does not specify chronicity.
Do not use for
Do not use H65.33 for acute otitis media, nonsuppurative otitis media without bilateral chronic mucoid wording, or ear symptoms alone. Check documentation.
Coding tip
Confirm both chronicity and bilateral laterality in the provider note before assigning H65.33.