Acute reactive otitis externa, left ear

This code signifies an acute inflammatory response of the external ear canal, specifically in the left ear, due to an identifiable irritant or allergen. It is characterized by sudden onset of symptoms like pain, itching, and discharge, often triggered by exposure to water, chemicals, or foreign bodies.

Apply this code when documentation clearly indicates an acute, reactive inflammation of the left external auditory canal. This typically occurs following exposure to an irritant, such as contaminated water (swimmer's ear), harsh chemicals, or allergic reactions to topical agents. The medical record should specify "acute reactive otitis externa" and laterality as "left ear."

• Differentiate from infectious otitis externa (H60.3-) which implies a bacterial or fungal etiology.
• Ensure documentation specifies "reactive" or an identifiable irritant/allergen to support this code.
• Verify laterality; codes for right (H60.551) and bilateral (H60.553) ears exist.