Acute serous otitis media, unspecified ear

This code signifies an acute inflammation of the middle ear characterized by the presence of serous (thin, watery) fluid without signs of infection. It indicates a sudden onset of middle ear effusion, often associated with Eustachian tube dysfunction, but without purulence or bacterial involvement.

Use this code when documentation specifies acute serous otitis media without laterality specified. This diagnosis is typically made based on otoscopic examination revealing a dull, retracted, or bulging tympanic membrane with a visible fluid level or air bubbles, in the absence of fever or purulent discharge.

• Do not use this code if the documentation specifies laterality (e.g., right, left, bilateral); instead, use the more specific H65.01, H65.02, or H65.03.
• Distinguish from acute suppurative otitis media (H66.0-) which involves purulent fluid and signs of infection.
• Ensure the "acute" nature is clearly documented to differentiate from chronic serous otitis media (H65.2-).