ICD-10 Code H91.22 – Sudden idiopathic hearing loss, left ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H91.22 – Sudden idiopathic hearing loss, left ear
What it is
H91.22 identifies sudden, unexplained hearing loss limited to the left ear. Use it when the record documents idiopathic onset rather than trauma, infection, or another known cause.
Clinical signs
Typical findings include abrupt unilateral hearing reduction, often noticed over hours to days. Clinical features vary; refer to documentation for associated tinnitus, ear fullness, or audiometric confirmation.
When to use this code
Use this code when the provider documents sudden idiopathic hearing loss affecting only the left ear and no cause is identified. It may be supported by audiology or specialist assessment. If the note names another etiology, code that condition instead.
Do not use for
Do not use it for conductive hearing loss, bilateral sudden hearing loss, or hearing loss with a documented cause such as trauma or infection. Check documentation if the laterality or etiology is unclear.
Coding tip
Confirm both laterality and the word “idiopathic” in the assessment before assigning H91.22.