Cochlear otosclerosis, left ear

This code signifies the presence of otosclerosis affecting the cochlea, specifically in the left ear. Cochlear otosclerosis is a progressive bone remodeling disorder of the otic capsule that can lead to sensorineural hearing loss due to its impact on the inner ear structures.

Assign this code when documentation clearly indicates cochlear otosclerosis diagnosed in the patient's left ear. This diagnosis is typically supported by audiometry showing sensorineural hearing loss, often accompanied by imaging studies (e.g., CT scan) demonstrating lucency or demineralization of the cochlear capsule.

• Ensure laterality is precisely documented; do not use for bilateral or unspecified ear involvement.
• Distinguish from stapedial otosclerosis (H80.0-) which primarily causes conductive hearing loss.
• Code any associated hearing loss separately if specified (e.g., H90.5 for sensorineural hearing loss, unspecified).