Sudden idiopathic hearing loss, left ear

This code signifies an acute, unexplained sensorineural hearing loss that occurs rapidly, typically within 72 hours, affecting the left ear. It is characterized by a sudden decrease in hearing without an identifiable cause such as trauma, infection, or ototoxic drugs.

Apply this code when documentation explicitly states a diagnosis of sudden idiopathic hearing loss localized to the left ear. Supporting documentation should include the sudden onset of hearing loss and the exclusion of other potential etiologies.

• Ensure laterality is clearly documented as "left ear" to support this specific code.
• Distinguish from sudden hearing loss due to a known cause (e.g., viral infection, Meniere's disease), which would require a different code.
• Do not use for gradual hearing loss or hearing loss attributed to presbycusis.