Cholesteatoma of mastoid, unspecified ear

This code describes a cholesteatoma, which is an abnormal, noncancerous skin growth that can develop in the mastoid bone behind the eardrum. It is characterized by a sac-like cyst that sheds layers of old skin, leading to a buildup of dead skin cells and debris. This condition can cause progressive bone erosion and lead to complications if left untreated.

Use this code when documentation specifies a cholesteatoma located within the mastoid bone, and the laterality of the affected ear is not documented or is unknown. This diagnosis is typically made based on otoscopic examination, imaging studies (e.g., CT scan), and patient symptoms such as hearing loss, ear discharge, or dizziness.

• Ensure documentation clearly states the cholesteatoma is in the mastoid.
• If laterality (right, left, bilateral) is specified, use the more specific H71.21, H71.22, or H71.23.
• Do not confuse with cholesteatoma of the middle ear (H71.1-) or attic (H71.0-).