ICD-10 Code H66.90 – Otitis media, unspecified, unspecified ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H66.90 – Otitis media, unspecified, unspecified ear
What it is
This code identifies otitis media when the record does not specify the ear involved or the type of middle ear infection. Use it for a general diagnosis of middle ear inflammation or infection without further detail.
Clinical signs
Typical findings include ear pain, fever, irritability, or a bulging, erythematous tympanic membrane. Clinical features vary; refer to documentation if the exam is limited or the note is nonspecific.
When to use this code
Use H66.90 when the clinician documents otitis media but does not identify right, left, or bilateral ear involvement. It also fits when the chart lacks enough detail to code a more specific otitis media diagnosis. If laterality or type is documented elsewhere, code that information instead.
Do not use for
Do not use this code when the record specifies a different ear, a recurrent or chronic form, or an otitis media subtype with a distinct code. Check documentation if the diagnosis is actually otitis externa or another ear disorder.
Coding tip
Before assigning H66.90, look for laterality and otitis media type in the assessment, exam, or impression.