What does ICD-10 code K31 mean?

ICD-10 code K31 is the standardized code used for other diseases of stomach and duodenum in medical records and coding systems.

When is ICD-10 code K31 used?

Doctors, hospitals, and insurers may use ICD-10 code K31 when recording other diseases of stomach and duodenum in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code K31 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code K31: Other diseases of stomach and duodenum

Name: ICD-10 Code K31: Other diseases of stomach and duodenum
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:15:22.432Z

K31 is an ICD-10 diagnosis entry used to group records related to Other diseases of stomach and duodenum. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the digestive system (K00-K95).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the digestive system (K00-K95).

When is it used?

May be used when a clinician documents other diseases of stomach and duodenum in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

11Diseases of the digestive system (K00-K95)

block

K20-K31Diseases of esophagus, stomach and duodenum

currentK20-K31

Official coding notes

Includes

functional disorders of stomach

Excludes2 (may code together if documented)

diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43)
diverticulum of duodenum (K57.00-K57.13)

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

GastroenterologistGeneral Physician

Sibling codes

K20Esophagitis K21Gastro-esophageal reflux disease K22Other diseases of esophagus K23Disorders of esophagus in diseases classified elsewherebillable K25Gastric ulcer K26Duodenal ulcer K27Peptic ulcer, site unspecified K28Gastrojejunal ulcer K29Gastritis and duodenitis K30Functional dyspepsiabillable

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

K31

Replacement codes

K31.0 — Acute dilatation of stomachK31.1 — Adult hypertrophic pyloric stenosisK31.2 — Hourglass stricture and stenosis of stomachK31.3 — Pylorospasm, not elsewhere classifiedK31.4 — Gastric diverticulumK31.5 — Obstruction of duodenumK31.6 — Fistula of stomach and duodenumK31.7 — Polyp of stomach and duodenumK31.9 — Disease of stomach and duodenum, unspecified

Common synonyms

Other diseases of stomach and duodenum

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.