Chronic mastoiditis, unspecified ear

This code signifies a persistent, long-term inflammation of the mastoid air cells, the bony projections behind the ear, without specifying which ear is affected. It indicates a chronic infectious or inflammatory process within the mastoid bone.

Use this code when documentation clearly states "chronic mastoiditis" but does not specify laterality (left or right ear). This diagnosis is typically made based on clinical examination, imaging studies (e.g., CT scan), and patient history of recurrent or persistent ear infections and associated symptoms.

• Do not use if laterality is documented; instead, select a more specific code (H70.11-H70.13).
• Ensure documentation supports the "chronic" nature of the condition, distinguishing it from acute mastoiditis.
• Consider co-reporting with codes for underlying conditions like chronic otitis media if present and documented.