K31 Other diseases of stomach and duodenum

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Other diseases of stomach and duodenum is K31 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
K20-K31: Diseases of esophagus, stomach and duodenum (K20-K31)
Category K31
31 codes (25 billable)
FY2026 Status
Stable since FY2024
Includes
  • functional disorders of stomach
Excludes2
Not included here. These conditions are coded elsewhere but may be coded together if applicable.
  • diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43)
  • diverticulum of duodenum (K57.00-K57.13)

Official Coding Guidelines

Chapter 11 reserved for future expansion

11. Chapter 11: Diseases of the Digestive System (K00-K95) Reserved for future guideline expansion

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.11

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

More Specific Codes

K31.0 Acute dilatation of stomach K31.1 Adult hypertrophic pyloric stenosis K31.2 Hourglass stricture and stenosis of stomach K31.3 Pylorospasm, not elsewhere classified K31.4 Gastric diverticulum K31.5 Obstruction of duodenum K31.6 Fistula of stomach and duodenum K31.7 Polyp of stomach and duodenum K31.8 Other specified diseases of stomach and duodenum K31.81 Angiodysplasia of stomach and duodenum K31.811 Angiodysplasia of stomach and duodenum with bleeding K31.819 Angiodysplasia of stomach and duodenum without bleeding K31.82 Dieulafoy lesion (hemorrhagic) of stomach and duodenum K31.83 Achlorhydria K31.84 Gastroparesis K31.89 Other diseases of stomach and duodenum K31.9 Disease of stomach and duodenum, unspecified K31.A Gastric intestinal metaplasia K31.A0 Gastric intestinal metaplasia, unspecified K31.A1 Gastric intestinal metaplasia without dysplasia K31.A11 Gastric intestinal metaplasia without dysplasia, involving the antrum K31.A12 Gastric intestinal metaplasia without dysplasia, involving the body (corpus) K31.A13 Gastric intestinal metaplasia without dysplasia, involving the fundus K31.A14 Gastric intestinal metaplasia without dysplasia, involving the cardia K31.A15 Gastric intestinal metaplasia without dysplasia, involving multiple sites K31.A19 Gastric intestinal metaplasia without dysplasia, unspecified site K31.A2 Gastric intestinal metaplasia with dysplasia K31.A21 Gastric intestinal metaplasia with low grade dysplasia K31.A22 Gastric intestinal metaplasia with high grade dysplasia K31.A29 Gastric intestinal metaplasia with dysplasia, unspecified

Related Codes in K31

K31.0 Acute dilatation of stomach K31.1 Adult hypertrophic pyloric stenosis K31.2 Hourglass stricture and stenosis of stomach K31.3 Pylorospasm, not elsewhere classified K31.4 Gastric diverticulum K31.5 Obstruction of duodenum K31.6 Fistula of stomach and duodenum K31.7 Polyp of stomach and duodenum K31.8 Other specified diseases of stomach and duodenum K31.81 Angiodysplasia of stomach and duodenum K31.811 Angiodysplasia of stomach and duodenum with bleeding K31.819 Angiodysplasia of stomach and duodenum without bleeding K31.82 Dieulafoy lesion (hemorrhagic) of stomach and duodenum K31.83 Achlorhydria K31.84 Gastroparesis K31.89 Other diseases of stomach and duodenum K31.9 Disease of stomach and duodenum, unspecified K31.A Gastric intestinal metaplasia K31.A0 Gastric intestinal metaplasia, unspecified K31.A1 Gastric intestinal metaplasia without dysplasia
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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