Acute contact otitis externa, left ear

This code signifies an acute inflammatory condition of the external ear canal, specifically the left ear, caused by direct contact with an irritant or allergen. Symptoms typically include sudden onset of pain, itching, redness, and swelling of the auricle and external auditory meatus.

Apply this code when documentation clearly indicates an acute otitis externa in the left ear resulting from contact with a specific substance (e.g., chemicals, jewelry, earplugs). The physician's notes should specify the laterality and the acute nature of the inflammation, often noting a history of exposure.

• Ensure documentation specifies "acute" and "contact" as the etiology, along with the left ear.
• Do not confuse with non-contact otitis externa (e.g., bacterial, fungal) or chronic forms.
• Consider an additional code for the specific external cause if known and documented (e.g., T49.0X1A for adverse effect of topical anti-infectives).