ICD-10 Code B87.4 – Aural myiasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B87.4 – Aural myiasis
What it is
B87.4 identifies infestation of the ear by fly larvae. Use it when documentation states myiasis affecting the external ear or ear canal.
Clinical signs
Findings may include ear pain, discharge, itching, visible larvae, or a sensation of movement in the ear. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents aural myiasis, otic myiasis, or maggot infestation of the ear. It applies when the ear is the stated site of infestation, even if the note also describes local irritation or drainage.
If the record only mentions suspected insect exposure or a foreign body without confirmed larvae, check documentation before coding B87.4.
Do not use for
Do not use this code for general ear infections, otitis externa, or foreign bodies in the ear unless myiasis is specifically documented. Check documentation if the site of infestation is unclear.
Coding tip
Code B87.4 only when the provider clearly links the infestation to the ear; otherwise, query for the exact site.