Mastoiditis in infec/parastc diseases classd elswhr, bi

This code signifies inflammation of the mastoid air cells on both sides, occurring as a manifestation or complication of an underlying infectious or parasitic disease. It indicates that the mastoiditis is secondary to another condition, rather than being a primary infection.

Apply this code when documentation clearly states bilateral mastoiditis and explicitly links it to a specific infectious or parasitic disease (e.g., tuberculosis, syphilis, measles). The physician's notes should identify the primary infectious or parasitic condition that is causing or contributing to the mastoiditis.

• Always sequence the underlying infectious or parasitic disease first, followed by this code.
• Ensure documentation specifies "bilateral" involvement; otherwise, use the appropriate unilateral code (H75.01 or H75.02).
• Do not use this code for primary mastoiditis; refer to codes in the H70.xx series for acute or chronic mastoiditis not classified elsewhere.