ICD-10 Code for Dizziness: R42 Explained

Dizziness is one of the more common presenting complaints in primary care and urgent care, and its ICD-10 code is straightforward — but only when it's used correctly as a symptom code, not a placeholder for a diagnosis that's actually already known.

R42 is a single, uncomplicated code, but the coding principle behind when to use it matters more than the code itself.

The Code: R42

R42 ("Dizziness and giddiness") is a billable ICD-10-CM code covering dizziness, lightheadedness, dysequilibrium, and related balance disturbances when no definitive underlying cause has been identified. It sits in the symptoms and signs chapter of ICD-10-CM, not among the diagnosis-specific codes.

When R42 Is (and Isn't) the Right Code

R42 is appropriate for dizziness that's still being evaluated or genuinely has no identified cause. If a workup identifies a specific cause — benign paroxysmal positional vertigo, orthostatic hypotension, an inner ear condition, or a cardiac arrhythmia — that specific diagnosis should be coded instead, since R42 as a symptom code is meant to be temporary, not a permanent stand-in once a cause is confirmed.

Common Diagnostic Workup

Dizziness workups vary widely depending on the suspected cause, but frequently include orthostatic blood pressure checks (to screen for orthostatic hypotension), an EKG when a cardiac cause is suspected, and in some cases referral for vestibular testing when a specific inner ear or balance disorder is suspected.

Documentation Tips

Because R42 covers a fairly broad set of related sensations (dizziness, giddiness, lightheadedness, dysequilibrium), documentation that specifies exactly what the patient is experiencing — a spinning sensation versus a feeling of faintness versus unsteadiness — helps support both the appropriateness of R42 in the meantime and the direction of the subsequent workup.

Get a free practice audit and we'll check whether your practice's dizziness claims transition to more specific diagnosis codes once a workup identifies a cause.

Frequently Asked Questions

Is R42 billable? Yes, R42 is a billable, specific ICD-10-CM code.

Does R42 cover vertigo specifically? It covers dizziness and giddiness broadly, including some vertiginous presentations, but true vertigo with a confirmed cause (such as BPPV) has its own more specific code once diagnosed.

Should R42 be used once a cause is identified? No — once a specific underlying diagnosis is confirmed, that diagnosis should be coded instead of the general symptom code.

What testing is commonly done to evaluate dizziness? Orthostatic blood pressure checks and an EKG are common first-line steps, with vestibular testing or imaging reserved for cases where a specific cause is suspected and not resolved by initial evaluation.

Is dizziness always a low-acuity complaint? Not necessarily — dizziness can be a symptom of serious underlying conditions including cardiac arrhythmias or neurological events, which is part of why thorough initial evaluation and documentation matter for this symptom.