2027 ICD-10-CM Diagnosis Code K31Other diseases of stomach and duodenum

ICD-10-CM Codes›K00–K95›K20-K31›K31

ICD-10-CM K31
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

K31 is a non-billable ICD-10-CM category code for other diseases of stomach and duodenum, so it cannot be submitted on claims. Use a more specific code from this category instead, such as K31.0, K31.1, K31.2, and K31.3.

Code Identity

ICD-10-CM Code
K31
Billable Status
No — Non-Billable Category
Code Describes
Other diseases of stomach and duodenum
Short Description
Other diseases of stomach and duodenum
Same as the full description in the CMS dataset.
Chapter
K20-K31
Diseases of esophagus, stomach and duodenum

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK31Other diseases of stomach and duodenum
This CodeK31Other diseases of stomach and duodenum

Specific Coding for Other diseases of stomach and duodenumOverview

Non-specific codes like K31 require more characters. Use one of these billable codes instead:

  • Use K31.0 for Acute dilatation of stomach

  • Use K31.1 for Adult hypertrophic pyloric stenosis

  • Use K31.2 for Hourglass stricture and stenosis of stomach

  • Use K31.3 for Pylorospasm, not elsewhere classified

  • Use K31.4 for Gastric diverticulum

  • Use K31.5 for Obstruction of duodenum

  • Use K31.6 for Fistula of stomach and duodenum

  • Use K31.7 for Polyp of stomach and duodenum

  • K31.8 for Other specified diseases of stomach and duodenum

  • K31.81 for Angiodysplasia of stomach and duodenum

  • Use K31.82 for Dieulafoy lesion (hemorrhagic) of stomach and duodenum

  • Use K31.83 for Achlorhydria

  • Use K31.84 for Gastroparesis

  • Use K31.89 for Other diseases of stomach and duodenum

  • Use K31.9 for Disease of stomach and duodenum, unspecified

  • K31.A for Gastric intestinal metaplasia

  • Use K31.A0 for Gastric intestinal metaplasia, unspecified

  • K31.A1 for Gastric intestinal metaplasia without dysplasia

  • K31.A2 for Gastric intestinal metaplasia with dysplasia

  • Use K31.B for Hypertrophic pyloric stenosis, in childhood

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to K31: its own notes plus those printed at block K20-K31 and Chapter 11. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

  • functional disorders of stomach

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On K31 itself
From Block K20-K31 Diseases of esophagus, stomach and duodenum applies to 106 codes
From Chapter 11 (K00-K95) Diseases of the digestive system applies to 863 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name K31, its category, or a range that includes it.

Excludes2 1

These codes carry an Excludes2 note naming K31: its condition is not part of those codes, and both may be reported when the patient has both.

  • K59 Other functional intestinal disorders
    functional disorders of stomach (K31.-)

Patient EducationClinical

Stomach Disorders

Your stomach is an organ between your esophagus and small intestine. It is where digestion of protein begins. The stomach has three tasks. It stores swallowed food. It mixes the food with stomach acids. Then it sends the mixture on to the small intestine.

Read the full article at MedlinePlus

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

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About K31Overview

What is the ICD-10 code for other diseases of stomach and duodenum?

K31 is the ICD-10-CM category for other diseases of stomach and duodenum, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is K31 (Other diseases of stomach and duodenum) a billable code?

No. This is a category header that groups the codes for other diseases of stomach and duodenum, and headers cannot be submitted on claims. Claims for other diseases of stomach and duodenum need a more specific code from this category, such as K31.0, K31.1, and K31.2.