Abnormal vestibular function study

This code indicates an abnormal result from a diagnostic test evaluating the function of the vestibular system, which is responsible for balance and spatial orientation. Such studies assess the inner ear and associated neural pathways for conditions causing dizziness, vertigo, or imbalance.

Use this code when documentation explicitly states an abnormal finding from a vestibular function study, such as electronystagmography (ENG), videonystagmography (VNG), or caloric testing. This code is appropriate when the specific underlying cause of the abnormality is not yet definitively diagnosed or is coded separately.

• Do not use this code as a primary diagnosis if a more specific diagnosis for the underlying vestibular disorder (e.g., Meniere's disease, benign paroxysmal positional vertigo) is established.
• This code often accompanies codes for symptoms like dizziness (R42) or vertigo (H81.x) if the definitive diagnosis is still pending.
• Ensure the medical record clearly documents the specific vestibular function study performed and the abnormal findings.