ICD-10 Code H61.812 – Exostosis of left external canal (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H61.812 – Exostosis of left external canal
What it is
H61.812 identifies a bony overgrowth in the left external auditory canal. It is a localized ear canal exostosis, often documented when the finding is on the left side.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a narrowed ear canal, visible bony prominence on otoscopy, or symptoms related to canal obstruction such as recurrent debris retention.
When to use this code
Use this code when the provider documents exostosis specifically in the left external canal. It is appropriate for confirmed anatomic findings on exam, imaging, or specialist assessment. If the note only says “ear canal exostosis” without laterality, check documentation.
Do not use for
Do not use this code for right-sided, bilateral, or unspecified external canal exostosis. Also avoid it when the documentation describes another ear canal mass or a different ear disorder.
Coding tip
Verify laterality in the assessment or procedure note before assigning H61.812.