Cholesteatoma of mastoid, right ear

This code signifies the presence of a cholesteatoma, an abnormal, non-cancerous skin growth, specifically located within the mastoid bone of the right ear. This growth can erode bone and damage structures within the middle ear and mastoid, potentially leading to hearing loss and other complications.

Apply this code when documentation clearly indicates a cholesteatoma affecting the mastoid air cells or bone, and explicitly specifies the right ear as the affected side. This diagnosis is typically confirmed through otoscopic examination, imaging studies (e.g., CT scan), and sometimes surgical findings.

• Ensure laterality is precisely documented (right, left, or bilateral) as separate codes exist for other sides.
• Distinguish from cholesteatoma of the middle ear (H71.1-) or attic (H71.0-), which are distinct anatomical locations.
• Code any associated complications, such as ossicular chain destruction or facial nerve paralysis, separately.