Unspecified mastoiditis, bilateral

This code signifies an inflammatory process affecting the mastoid air cells on both sides of the head, where the specific type or cause of the inflammation has not been determined. It indicates a bilateral mastoid infection or inflammation without further diagnostic specificity.

This code is appropriate when documentation indicates mastoiditis affecting both ears, but the physician has not specified the acute or chronic nature, or the presence of complications. It should be used when the medical record explicitly states "bilateral unspecified mastoiditis" or similar terminology lacking further detail.

• Avoid using this code if the documentation specifies acute, chronic, or recurrent mastoiditis; instead, use a more specific code from the H70.0-H70.2 series.
• Ensure the medical record clearly indicates involvement of both mastoids. If only one side is affected, use the appropriate unilateral unspecified mastoiditis code (H70.91 or H70.92).
• If a causative organism is identified, consider an additional code to specify the infection, if applicable and supported by documentation.