Otosclerosis involving oval window, obliterative, unsp ear

This code describes a form of otosclerosis where abnormal bone growth completely obstructs the oval window, leading to conductive hearing loss. This obliterative process prevents sound transmission from the middle ear to the inner ear. The "unspecified ear" designation indicates that the laterality (left or right) is not documented.

Use this code when documentation specifies obliterative otosclerosis affecting the oval window, and the medical record does not indicate whether it affects the left or right ear. This typically occurs in patients presenting with progressive conductive hearing loss, confirmed by audiometry and imaging, where surgical intervention (e.g., stapedectomy) is being considered or has been performed.

• Always seek clarification from the provider if the laterality of the affected ear is not documented.
• Distinguish from non-obliterative otosclerosis of the oval window (H80.0-) and cochlear otosclerosis (H80.2-).
• Consider sequencing this code with codes for associated hearing loss (e.g., H90.0-H90.2) if documented.