Chronic petrositis, bilateral

This code signifies a persistent, long-standing inflammation of the petrous apex of the temporal bone affecting both ears. This condition can lead to various neurological symptoms due to the proximity of cranial nerves, such as facial pain, diplopia, and hearing loss. It is often a complication of inadequately treated acute otitis media or mastoiditis.

Use this code when documentation clearly indicates chronic inflammation of the petrous bone affecting both the left and right sides. Supporting documentation should include imaging reports (e.g., CT or MRI) confirming petrous apex involvement and clinical notes detailing the chronic nature of the condition and bilateral presentation.

• Ensure documentation specifies "chronic" and "bilateral" to support this code.
• Distinguish from acute petrositis (H70.21-) and unilateral chronic petrositis (H70.221, H70.222).
• Code any associated complications, such as cranial nerve palsies or meningitis, separately.