Mastoiditis in infec/parastc dis classd elswhr, unsp ear

This code signifies inflammation of the mastoid bone, specifically when it arises as a complication or manifestation of an underlying infectious or parasitic disease. It indicates that the specific ear affected (left, right, or bilateral) is not documented.

Apply this code when documentation clearly links mastoiditis to an infectious or parasitic condition, such as tuberculosis, syphilis, or measles, and the ear laterality is not specified. The primary infectious or parasitic disease should be coded first.

• Always sequence the underlying infectious or parasitic disease code first, followed by this code.
• Avoid using this code if the mastoiditis is not explicitly stated as being due to an infectious or parasitic disease classified elsewhere; instead, use a code from H70.0- for acute mastoiditis.
• Query the provider for laterality if not specified, to allow for more specific coding (H75.01, H75.02, H75.03).