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

ICD-10-CM Diagnosis Code (2025)

Official Description for K31

Other diseases of stomach and duodenum

Coding Notes & Guidelines for K31

Includes Notes

functional disorders of stomach

Excludes1: Not Coded Here

congenital or infantile pyloric stenosis (Q40.0)

Excludes1: Not Coded Here
  • congenital hourglass stomach (Q40.2)
  • hourglass contraction of stomach (K31.89)
Excludes1: Not Coded Here
  • congenital or infantile pylorospasm (Q40.0)
  • neurotic pylorospasm (F45.8)
  • psychogenic pylorospasm (F45.8)
Excludes1: Not Coded Here

congenital diverticulum of stomach (Q40.2)

Excludes1: Not Coded Here

congenital stenosis of duodenum (Q41.0)

Excludes1: Not Coded Here

adenomatous polyp of stomach (D13.1)

Excludes2: Not Included Here
  • diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43)
  • diverticulum of duodenum (K57.00-K57.13)
Excludes2: Not Included Here

Dieulafoy lesion of intestine (K63.81)

Code First
  • underlying disease, if known, such as:
  • anorexia nervosa (F50.0-)
  • diabetes mellitus (E08.43, E09.43, E10.43, E11.43, E13.43)
  • scleroderma (M34.-)
Inclusion Terms

Acute distention of stomach

Inclusion Terms

Pyloric stenosis NOS

Inclusion Terms
  • Constriction of duodenum
  • Duodenal ileus (chronic)
  • Stenosis of duodenum
  • Stricture of duodenum
  • Volvulus of duodenum
Inclusion Terms
  • Gastrocolic fistula
  • Gastrojejunocolic fistula
Inclusion Terms

Angiodysplasia of stomach and duodenum NOS

Inclusion Terms

Gastroparalysis

Inclusion Terms
  • Gastric intestinal metaplasia indefinite for dysplasia
  • Gastric intestinal metaplasia NOS
Code Also

, if applicable, disruption of internal operation (surgical) wound (T81.32-)

Child Codes (More Specific Codes for 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 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

About ICD-10-CM Code K31 (Other diseases of stomach and duodenum)

ICD-10-CM code K31 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM K31 became effective on October 1, 2024.

This page provides detailed information about K31 - Other diseases of stomach and duodenum. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Other diseases of stomach and duodenum.