Exostosis of external canal, unspecified ear

This code signifies the presence of an abnormal bony growth within the external auditory canal, without specifying which ear is affected. These benign growths, often referred to as "surfer's ear," can partially or completely obstruct the canal.

Use this code when documentation confirms the diagnosis of an exostosis in the external ear canal, but the medical record does not specify laterality (left or right ear). This typically occurs when the physician's notes indicate "exostosis of external canal" without further detail.

• Ensure the documentation explicitly states "unspecified ear" or lacks laterality information.
• If laterality is documented (e.g., right, left, bilateral), use the more specific codes (H61.811, H61.812, H61.813).
• Do not confuse exostosis with osteoma, though both are bony growths; exostoses are typically broader-based.