Acute serous otitis media, right ear

This code signifies an acute inflammation of the right middle ear characterized by the presence of thin, watery fluid (serous effusion) without signs of active infection. It typically results from eustachian tube dysfunction, leading to negative pressure and fluid accumulation behind the eardrum.

Use this code when documentation clearly indicates a diagnosis of acute serous otitis media affecting the right ear. This diagnosis is often made based on otoscopic examination revealing a dull, retracted tympanic membrane with a visible fluid level or air bubbles, and the absence of purulence.

• Ensure the documentation specifies "acute" and "serous" to differentiate from chronic or mucoid forms.
• Laterality is crucial; confirm the right ear is explicitly documented.
• Do not confuse with acute suppurative otitis media (H66.01-), which involves purulent effusion and signs of active infection.