2026 ICD-10-CM Diagnosis Code K30Functional dyspepsia

ICD-10-CM Codes›K00–K95›K20-K31›K30

ICD-10-CM K30
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K30 is a billable ICD-10-CM diagnosis code for functional dyspepsia. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified disorders of stomach and duodenum.

Code Identity

ICD-10-CM Code
K30
Billable Status
Yes — Valid for Submission
Code Describes
Functional dyspepsia
Chapter
K20-K31
Diseases of esophagus, stomach and duodenum

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK30Functional dyspepsia
This CodeK30Functional dyspepsia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal gastric acidity
  • Abnormal gastric secretion
  • Delayed gastric emptying
  • Dyspepsia caused by drug
  • Dyspepsia during pregnancy
  • Finding of general observation of digestion
  • Flatulent dyspepsia
  • Impaired gastric emptying
  • Indigestion
  • Inhibition of gastric motility
  • Mild dietary indigestion
  • Nonulcer dyspepsia
  • Postprandial distress syndrome
  • Upset stomach

Tabular List NotesGuidance

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

Inclusion Terms

  • Indigestion

Type 1 Excludes

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.

    • Acid
      • peptic disease
    • Acid
      • stomach
    • Acidity, gastric(high)
    • Apepsia
    • Delay, delayed
      • gastric emptying
    • Disease, diseased
      • acid-peptic
    • Disorder(of)
      • gastric (functional)
        • motility
    • Disorder(of)
      • gastric (functional)
        • secretion
    • Distress
      • gastrointestinal (functional)
    • Disturbance(s)
      • digestive
    • Disturbance(s)
      • gastrointestinal (functional)
    • Dyspepsia
      • atonic
    • Dyspepsia
      • functional (allergic) (congenital) (gastrointestinal) (occupational) (reflex)
    • Indigestion(acid) (bilious) (functional)
    • Upset
      • gastric
    • Upset
      • gastrointestinal
    • Upset
      • stomach

Clinical ClassificationClinical

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

CCSR DIG008
Other specified and unspecified disorders of stomach and duodenum
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Indigestion

Nearly everyone has had indigestion at one time. It's a feeling of discomfort or a burning feeling in your upper abdomen. You may have heartburn or belch and feel bloated. You may also feel nauseated, or even throw up.

Read the full article at MedlinePlus

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

Convert K30 to ICD-9-CMHistory

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

ICD-9-CM
536.8 Stomach function dis NEC
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 K30Overview

Is K30 (Functional dyspepsia) a billable code?

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

What MS-DRG does K30 group to?

When functional dyspepsia 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.

What is the ICD-9 equivalent of K30?

Under the General Equivalence Mappings, functional dyspepsia converts to ICD-9-CM 536.8 (stomach function dis NEC). 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.