2026 ICD-10-CM Diagnosis Code G43.A0Cyclical vomiting, in migraine, not intractable

ICD-10-CM Codes›G00–G99›G40-G47›G43

ICD-10-CM G43.A0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G43.A0 is a billable ICD-10-CM diagnosis code for cyclical vomiting, in migraine, not intractable. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 102 through 103. Coders also document this condition as cyclical vomiting syndrome. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Headache; including migraine and Nausea and vomiting.

Code Identity

ICD-10-CM Code
G43.A0
Billable Status
Yes — Valid for Submission
Code Describes
Cyclical vomiting, in migraine, not intractable
Short Description
Cyclical vomiting, in migraine, not intractable
Same as the full description in the CMS dataset.
Parent Code
G43.A
Cyclical vomiting

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG40-G47Episodic and paroxysmal disorders
CategoryG43Migraine
This CodeG43.A0Cyclical vomiting, in migraine, not intractable

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cyclical vomiting syndrome

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Cyclical vomiting, without refractory migraine

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Cyclical vomiting, in migraine,
    • Vomiting
      • cyclical, in migraine,
    • Vomiting
      • cyclical, in migraine,
        • not intractable
    • Vomiting
      • cyclical, in migraine,
        • without refractory migraine

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS010
Headache; including migraine
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR SYM004
Nausea and vomiting
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Cyclical Vomiting

    a condition characterized by recurrent, self-limiting episodes of vomiting associated with intense nausea, pallor, and lethargy. it is commonly a migraine precursor.

Patient EducationClinical

Nausea and Vomiting

Nausea is when you feel sick to your stomach, as if you are going to throw up. Vomiting is when you throw up.

The full article covers:

  • What are nausea and vomiting?
  • What causes nausea and vomiting?
  • When do I need to see a health care provider for nausea and vomiting?
  • How is the cause of nausea and vomiting diagnosed?
  • What are the treatments for nausea and vomiting?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G43.A0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
346.20 Vrnt mgrn wo ntr mgr NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G43.A0Overview

Is G43.A0 (Cyclical vomiting) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report cyclical vomiting, in migraine, not intractable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does G43.A0 group to?

When cyclical vomiting, in migraine, not intractable is the principal diagnosis on an inpatient stay, it groups to MS-DRG 102, 103, with relative weights from 0.8363 to 1.1209 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of G43.A0?

Under the General Equivalence Mappings, cyclical vomiting, in migraine, not intractable converts to ICD-9-CM 346.20 (vrnt mgrn wo ntr mgr NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.