ICD-10 Code H66.91 – Otitis media, unspecified, right ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H66.91 – Otitis media, unspecified, right ear
What it is
This code identifies otitis media affecting the right ear when the type is not further specified. Use it when documentation confirms middle ear infection or inflammation, but does not name an acute, chronic, or other subtype.
Clinical signs
Typical findings include ear pain, reduced hearing, ear fullness, or a bulging tympanic membrane. Clinical features vary; refer to documentation.
When to use this code
Use H66.91 when the record clearly states right-sided otitis media and gives no more specific classification. It also fits when the provider documents otitis media of the right ear without identifying acute, chronic, serous, or suppurative disease.
Do not assume laterality from a general ear infection note; you need right ear documentation. If the note is incomplete or ambiguous, check documentation before coding.
Do not use for
Do not use this code for left, bilateral, or unspecified ear disease. Also avoid it when the chart supports a more specific otitis media code, such as acute or chronic forms.
Coding tip
Code the documented laterality and specificity exactly as written; if the right ear is not stated, verify the note before assigning H66.91.