Mastoiditis in infec/parastc diseases classd elswhr, r ear

This code signifies inflammation of the right mastoid bone that is a manifestation of an underlying infectious or parasitic disease. It indicates that the mastoiditis is not the primary diagnosis but rather a secondary condition caused by another systemic infection.

Use this code when documentation clearly links right-sided mastoiditis to a specific infectious or parasitic disease, such as tuberculosis, syphilis, or HIV, which is coded separately. The medical record should explicitly state the causal relationship between the systemic infection and the mastoiditis.

• Always sequence the underlying infectious or parasitic disease code first, followed by this code.
• Ensure the documentation specifies "right ear" and the infectious/parasitic etiology.
• Do not use this code for mastoiditis due to otitis media; use codes from H70.- for those cases.