All ICD10 Codes
K31Not billable, use a more specific code below

Other diseases of stomach and duodenum

In Diseases of esophagus, stomach and duodenum (K20-K31), chapter 11: Diseases of the Digestive System

26 billable codes under K31: 2 are an MCC, 5 are a CC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.

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Instructional notes

Includes: conditions that are coded here

  • functional disorders of stomach

Excludes2: not included here, code separately if applicable

Also applies, from Diseases of esophagus, stomach and duodenum (K20-K31)

These notes sit on K20-K31 and apply to every code under it, including K31.

Excludes2: not included here, code separately if applicable

  • hiatus hernia (K44.-)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

There are no chapter-specific rules for Chapter 11 yet, so the general rules in Section I.B apply.

Read Section I.C.11 (page 58)

All codes under K31

K31 can't be used on a claim. Pick a billable code below; grey headings group them.

K31 MS-DRGs

As the principal diagnosis, the billable codes under K31 group to these 13 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to K31

Notes on these codes point to K31.

  • K59 Excludes2: functional disorders of stomach (K31.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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 more about stomach disorders on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.