Chronic mastoiditis, right ear

This diagnosis code signifies a persistent, long-term inflammation of the mastoid air cells located behind the right ear. It typically results from inadequately treated acute otitis media and can lead to bone erosion, abscess formation, or other serious complications.

Apply this code when documentation clearly indicates chronic inflammation of the mastoid bone specifically affecting the right ear. Supporting clinical notes should detail symptoms such as persistent otorrhea, postauricular pain, hearing loss, or imaging findings consistent with chronic mastoiditis in the right ear.

• Ensure laterality is explicitly documented as "right ear" to support this specific code.
• Distinguish from acute mastoiditis; this code is for chronic presentations.
• Consider co-reporting with codes for any associated complications, such as cholesteatoma or facial nerve paralysis, if present.