Acute petrositis, left ear

This code signifies an acute inflammatory process affecting the petrous apex of the temporal bone, specifically in the left ear. This condition often arises as a complication of acute otitis media, where infection spreads from the middle ear into the air cells of the petrous bone.

Assign this code when documentation clearly indicates a diagnosis of acute petrositis affecting the left ear. Supporting clinical findings may include deep ear pain, retro-orbital pain, diplopia (Gradenigo's syndrome), and purulent discharge, often confirmed by imaging studies like CT or MRI.

• Ensure documentation specifies "acute" petrositis; chronic petrositis codes are distinct.
• Laterality is crucial; verify the affected ear (left, right, or bilateral) is clearly stated.
• Look for associated conditions like otitis media or mastoiditis, which may require additional coding.