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ICD-10-CM 2027 diagnosis code

R42Dizziness and giddiness

✓ Billable / specific

R42 is a valid, billable ICD-10-CM code for dizziness and giddiness. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Vertigo, ICD-10 code for Dizziness, ICD-10 code for Giddiness, ICD-10 code for Dysequilibrium.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About R42

R42 is the ICD-10-CM diagnosis code for Dizziness and giddiness. It belongs to block R40-R46 (symptoms and signs involving cognition, perception, emotional state and behavior) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Don't report R42 together with the conditions in its Excludes1 note: vertiginous syndromes (H81.-) and vertigo from infrasound (T75.23).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 149 (Dysequilibrium, relative weight 0.7527), in MDC 03 (Diseases and Disorders of the Ear, Nose, Mouth and Throat), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 780.4 (Dizziness and giddiness).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Light-headedness
  • Vertigo NOS
Excludes1Not coded here — never report together with this code
  • vertiginous syndromes (H81.-)
  • vertigo from infrasound (T75.23)

Notes that apply from higher levels

Instructions written at a parent level also apply to R42.

Broader instructions also apply from R40-R46 Symptoms and signs involving cognition, perception, emotional state and behavior and Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.

Alphabetic index entries

8 entries

Terms in the official ICD-10-CM index that lead to R42.

Codes whose notes reference R42

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 03 · Diseases and Disorders of the Ear, Nose, Mouth and Throat

ICD-9-CM equivalent

Converter →
  • 780.4Dizziness and giddinessexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about R42

Is R42 billable?

Yes. R42 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can R42 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict R42 as a principal diagnosis.

Is R42 a CC or MCC?

No. R42 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does R42 group to?

R42 is used in the MS-DRG v44.0 logic for MS-DRG 149 (Dysequilibrium). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for R42?

The CMS General Equivalence Mappings map R42 to ICD-9-CM 780.4.