Exostosis of left external canal

This code describes an abnormal bony growth, or exostosis, located within the external auditory canal of the left ear. These benign growths typically develop slowly and can lead to narrowing of the ear canal.

Use this code when documentation specifies a diagnosis of exostosis affecting the external auditory canal of the left ear. This is often identified during otoscopic examination or imaging studies.

• Ensure the laterality (left ear) is clearly documented.
• Distinguish from osteoma, which is a solitary, pedunculated bony tumor, whereas exostoses are typically multiple and sessile.
• Do not use for unspecified ear exostosis; a more specific code is available if laterality is not documented.