R42 is the ICD-10-CM code for dizziness and giddiness. Use it when dizziness is the reason for the visit and the provider hasn't confirmed what is causing it. Once the provider documents a definitive diagnosis, such as a vestibular disorder, that diagnosis is coded instead.
What is ICD-10 Code R42?
ICD-10 code R42 is "Dizziness and giddiness," a code for a symptom rather than a confirmed condition. It sits in Chapter 18 of ICD-10-CM (R00–R99), the chapter for symptoms, signs and abnormal findings not classified elsewhere. It is a valid, billable code.
The official guidelines allow symptom codes like this one when a related definitive diagnosis has not been established by the provider (ICD-10-CM Official Guidelines, FY 2027, Section I.B.4).
Clinical Definition and Scope
Its inclusion terms in the ICD-10-CM Tabular List are:
- Lightheadedness
- Vertigo NOS (not otherwise specified)
Related symptoms have their own codes: near-fainting or fainting goes to R55 (Syncope and collapse), and unsteadiness on feet to R26.81.
Common Symptoms Associated with R42
Patients coded under R42 often describe one or more of these. Symptoms other than dizziness, lightheadedness and vertigo are coded separately when they are documented and not routinely part of the diagnosis:
- Sensation of spinning or motion (vertigo)
- Unsteadiness while walking (R26.81)
- Near-fainting or fainting episodes (R55)
- Nausea or vomiting (R11.-)
- General disorientation
Patients describe dizziness in different ways, so the note should record what the patient actually reported. "Room spinning" and "felt faint" point to different codes.
Causes of Dizziness and Giddiness
R42 doesn't name a cause. When the provider does confirm one, the cause is coded instead of R42. Common examples:
- Vestibular disorders, such as benign paroxysmal positional vertigo (BPPV) or vestibular neuritis, which code to the vertiginous syndromes (H81.-).
- Cardiovascular problems, such as low blood pressure or an arrhythmia.
- Neurological conditions, such as migraine.
- Medication side effects.
- Dehydration or anemia. For anemia codes, see our post on anemia ICD-10 codes.
When Should You Use ICD-10 Code R42?
Use R42 when:
- The patient's main complaint is dizziness or giddiness
- The provider has not yet confirmed the underlying cause
- The symptom is the focus of the visit
Don't use R42 when a specific condition has been identified. If the patient is diagnosed with a defined vestibular disorder, code that disorder.
In an office or outpatient visit, a diagnosis the provider writes as "probable," "suspected," "rule out" or "working diagnosis" is not coded. You code the symptom instead (Official Guidelines, Section IV.H). So a note that says "dizziness, rule out BPPV" is coded R42, not H81.1-. Hospital inpatient coding follows a different rule.
Coding Guidelines and Exclusions
Excludes1 Conditions
R42 has two Excludes1 notes, which means it is not reported together with:
- Vertiginous syndromes (H81.-)
- Vertigo caused by infrasound (T75.23)
Key Coding Tips
- Use R42 only when the symptom is not yet linked to a confirmed diagnosis.
- Don't add R42 next to a diagnosis that already explains the dizziness. Signs and symptoms routinely part of a disease process aren't coded separately (Section I.B.5).
- Do code other symptoms that aren't routinely part of the diagnosis when they're documented (Section I.B.6).
- Make sure the note supports the code: the complaint, what was examined and the plan.
Common Billing Mistakes with R42
These are the patterns that get R42 claims denied or questioned:
- R42 carried forward after a diagnosis. The first visit was coded R42, the follow-up confirmed BPPV, and the claim still says R42. Each visit is coded from that visit's note.
- R42 billed with H81.-. The Excludes1 note says they don't go together, and payer edits catch it.
- A "rule out" diagnosis coded as if confirmed. In the office, code the symptom.
- R42 used for faintness or unsteadiness. Those are R55 and R26.81.
- R42 as the only reason for an expensive test without checking the payer's policy. Some payers cover certain imaging and lab tests only for the diagnoses their coverage policy lists, so check it before the claim goes out.
Documentation That Supports R42
Before the claim goes out, check that the note has:
- The patient's own description of the symptom (spinning, lightheaded, off balance)
- When it started and how often it happens
- What the provider examined or ordered to find the cause
- The assessment, worded as confirmed or not yet confirmed
- Any other symptoms that need their own codes
If the note is unclear on whether a cause was confirmed, ask the provider before coding rather than guessing. Our guide to medical coding explains how diagnosis and procedure codes work together on a claim.
Diagnostic Approach to Dizziness
How a provider works up dizziness is a clinical decision, and this post doesn't give clinical advice. For coding, what matters is the result: after the exam and any tests, the note either confirms a cause, which is then coded, or it doesn't, and R42 stays.
Treatment Options
Treatment is also the provider's call. For billing, R42 is often temporary. It is the right code while the cause is being found and is replaced once a cause is documented.
Where Beeline fits
Beeline codes each visit from the provider's note, checks the codes against payer edits before the claim goes out, and asks the provider when the documentation is unclear. Our medical coding service shows how, with a tool, "One claim line, taken apart." If you'd like a second look at how your diagnosis codes are holding up, start with a free consultation.
FAQs: What People Also Ask
What does ICD-10 code R42 mean?
ICD-10 code R42 is dizziness and giddiness, used when a patient has these symptoms without a confirmed underlying diagnosis.
Is R42 a billable code?
Yes, R42 is a valid and billable ICD-10-CM code used for medical documentation and insurance claims.
Can R42 be used with vertigo diagnosis?
No. If a specific vertigo condition is diagnosed, a more specific ICD-10 code is used instead of R42. Vertiginous syndromes (H81.-) are an Excludes1 note under R42.
What symptoms are included under R42?
R42 includes dizziness, giddiness, lightheadedness and vertigo NOS. Faintness (R55), unsteadiness on feet (R26.81) and nausea (R11.-) have codes of their own.
When should R42 not be used?
R42 should not be used when the cause of the dizziness is confirmed or when an excluded condition applies.
Is dizziness a disease or a symptom?
Dizziness is a symptom, not a disease, which is why it is coded in ICD-10-CM's symptom chapter.