Cholesteatoma of tympanum, left ear

This code signifies the presence of a cholesteatoma, a destructive, expanding growth of keratinizing squamous epithelium, specifically located within the tympanic membrane (eardrum) of the left ear. This lesion can erode surrounding bone and soft tissue, leading to hearing loss and other complications.

Apply this code when documentation clearly indicates a cholesteatoma originating from or primarily affecting the tympanic membrane of the left ear. This is typically diagnosed via otoscopy, audiometry, and potentially imaging studies like CT scans. Use for both acquired and congenital forms when the tympanum is the primary site.

• Differentiate from cholesteatoma of the attic or middle ear, which have distinct codes.
• Ensure laterality is accurately documented and coded (left ear).
• Look for associated complications (e.g., ossicular chain erosion, mastoiditis) which may require additional codes.