2026 ICD-10-CM Diagnosis Code R11.0Nausea

ICD-10-CM Codes›R00–R99›R10-R19›R11

ICD-10-CM R11.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R11.0 is a billable ICD-10-CM diagnosis code for nausea. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 391 through 392. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. Coders also document this condition as functional nausea. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nausea and vomiting.

Code Identity

ICD-10-CM Code
R11.0
Billable Status
Yes — Valid for Submission
Code Describes
Nausea
Short Description
Nausea
Same as the full description in the CMS dataset.
Parent Code
R11
Nausea and vomiting

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR10-R19Symptoms and signs involving the digestive system and abdomen
CategoryR11Nausea and vomiting
This CodeR11.0Nausea

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Functional nausea
  • Nausea
  • Nausea present
  • Postoperative nausea

Tabular List NotesGuidance

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

Inclusion Terms

  • Nausea NOS
  • Nausea without vomiting

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.

    • Nausea(without vomiting)

Clinical ClassificationClinical

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

CCSR SYM004
Nausea and vomiting
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Nausea

    an unpleasant sensation in the stomach usually accompanied by the urge to vomit. common causes are early pregnancy, sea and motion sickness, emotional stress, intense pain, food poisoning, and various enteroviruses.

  • Postoperative Nausea and Vomiting

    emesis and queasiness occurring after anesthesia.

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 R11.0 to ICD-9-CMHistory

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

ICD-9-CM
787.02 Nausea alone
Exact Match The mapping is direct, with no qualifiers.

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 R11.0Overview

Is R11.0 (Nausea and vomiting) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report nausea on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does R11.0 group to?

When nausea is the principal diagnosis on an inpatient stay, it groups to MS-DRG 391, 392, with relative weights from 0.7796 to 1.2683 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R11.0 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the nausea is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R11.0?

Under the General Equivalence Mappings, nausea converts to ICD-9-CM 787.02 (nausea alone). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.