Otosclerosis involving oval window, obliterative, bilateral

This code signifies otosclerosis, a condition characterized by abnormal bone growth in the middle ear, specifically affecting and obliterating the oval window. This bilateral involvement leads to progressive conductive hearing loss due to the fixation of the stapes bone.

Apply this code when documentation clearly indicates bilateral obliterative otosclerosis impacting the oval window. This diagnosis is typically made by an otolaryngologist based on audiometric findings (conductive hearing loss) and imaging studies, or during surgical exploration.

• Ensure the documentation specifies "obliterative" involvement of the oval window, not just general otosclerosis.
• Confirm the bilateral nature of the condition; unilateral involvement would require a different code.
• Do not confuse with other forms of otosclerosis (e.g., fenestral, cochlear) or other causes of conductive hearing loss.