Acute petrositis, bilateral

This code signifies an acute inflammatory process affecting the petrous apex of the temporal bone on both sides of the skull. This condition often arises as a complication of otitis media, leading to symptoms such as deep-seated ear pain, retro-orbital pain, and sometimes cranial nerve palsies.

Apply this code when documentation clearly indicates acute inflammation of the petrous bone affecting both ears. This diagnosis is typically supported by imaging studies (e.g., CT or MRI) demonstrating bilateral petrous apex involvement, alongside clinical signs and symptoms.

• Ensure documentation specifies "acute" and "bilateral" involvement; otherwise, consider codes for chronic or unilateral petrositis.
• Always code the underlying cause, such as otitis media, first if it is still active and being treated.
• Differentiate from mastoiditis, which involves a different part of the temporal bone, though they can co-occur.