Otosclerosis involving oval window, obliterative, left ear

This code signifies a progressive hearing loss condition caused by abnormal bone growth in the left inner ear, specifically affecting the oval window. This growth, characterized as obliterative, impedes the normal vibration of the stapes bone, leading to conductive hearing impairment.

Apply this code when documentation clearly indicates otosclerosis affecting the left ear, with specific mention of oval window involvement and an obliterative pattern. This diagnosis is typically made based on audiometric findings, clinical examination, and sometimes imaging studies.

• Ensure the documentation specifies "obliterative" involvement of the oval window; otherwise, a less specific code for otosclerosis may be more appropriate.
• Verify laterality (left ear) is explicitly stated. If bilateral, a different code or codes will be required.
• Distinguish from other forms of otosclerosis or conductive hearing loss not specifically involving the oval window or lacking the obliterative characteristic.