Diffuse cholesteatosis, left ear

This code signifies a non-neoplastic, destructive lesion of the left middle ear or mastoid, characterized by the presence of keratinizing squamous epithelium. This condition can lead to bone erosion and potential complications such as hearing loss, dizziness, or facial nerve paralysis. It is a chronic inflammatory process distinct from congenital cholesteatoma.

Use this code when documentation clearly indicates a diagnosis of diffuse cholesteatosis affecting the left ear. This diagnosis is typically made based on otoscopic examination, imaging studies (e.g., CT scan), and sometimes surgical findings. The physician's notes should specify the diffuse nature and laterality.

• Differentiate from localized cholesteatoma; this code specifies a diffuse presentation.
• Ensure laterality (left ear) is explicitly documented to support this specific code.
• Consider sequencing this code with any associated complications, such as conductive hearing loss or mastoiditis.