ICD-10-CM Book 2026 Edition

Chapters  /  Chapter 11  /  K20-K31

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

Excludes2: hiatus hernia (K44.-)
K20 Esophagitis
UseAdditionalCode code to identify:
alcohol abuse and dependence (F10.-)
Excludes1 erosion of esophagus (K22.1-)
esophagitis with gastro-esophageal reflux disease (K21.0-)
reflux esophagitis (K21.0-)
ulcerative esophagitis (K22.1-)
Excludes2 eosinophilic gastritis or gastroenteritis (K52.81)
K20.0 Eosinophilic esophagitis
K20.8 Other esophagitis
K20.80 Other esophagitis without bleeding
Abscess of esophagus
Other esophagitis NOS
K20.81 Other esophagitis with bleeding
K20.9 Esophagitis, unspecified
K20.90 Esophagitis, unspecified without bleeding
Esophagitis NOS
K20.91 Esophagitis, unspecified with bleeding
K21 Gastro-esophageal reflux disease
Excludes1 newborn esophageal reflux (P78.83)
K21.0 Gastro-esophageal reflux disease with esophagitis
K21.00 Gastro-esophageal reflux disease with esophagitis, without bleeding
Reflux esophagitis
K21.01 Gastro-esophageal reflux disease with esophagitis, with bleeding
K21.9 Gastro-esophageal reflux disease without esophagitis
Esophageal reflux NOS
K22 Other diseases of esophagus
Excludes2 esophageal varices (I85.-)
K22.0 Achalasia of cardia
Achalasia NOS
Cardiospasm
Excludes1 congenital cardiospasm (Q39.5)
K22.1 Ulcer of esophagus
Barrett's ulcer
Erosion of esophagus
Fungal ulcer of esophagus
Peptic ulcer of esophagus
Ulcer of esophagus due to ingestion of chemicals
Ulcer of esophagus due to ingestion of drugs and medicaments
Ulcerative esophagitis
CodeFirst poisoning due to drug or toxin, if applicable (T36-T65 with fifth or sixth character 1-4)
UseAdditionalCode code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
Excludes1 Barrett's esophagus (K22.7-)
K22.10 Ulcer of esophagus without bleeding
Ulcer of esophagus NOS
K22.11 Ulcer of esophagus with bleeding
Excludes2 bleeding esophageal varices (I85.01, I85.11)
K22.2 Esophageal obstruction
Compression of esophagus
Constriction of esophagus
Stenosis of esophagus
Stricture of esophagus
Excludes1 congenital stenosis or stricture of esophagus (Q39.3)
K22.3 Perforation of esophagus
Rupture of esophagus
Excludes1 traumatic perforation of (thoracic) esophagus (S27.8-)
K22.4 Dyskinesia of esophagus
Corkscrew esophagus
Diffuse esophageal spasm
Spasm of esophagus
Excludes1 cardiospasm (K22.0)
K22.5 Diverticulum of esophagus, acquired
Esophageal pouch, acquired
Excludes1 diverticulum of esophagus (congenital) (Q39.6)
K22.6 Gastro-esophageal laceration-hemorrhage syndrome
Mallory-Weiss syndrome
K22.7 Barrett's esophagus
Barrett's disease
Barrett's syndrome
Excludes1 Barrett's ulcer (K22.1)
malignant neoplasm of esophagus (C15.-)
K22.70 Barrett's esophagus without dysplasia
Barrett's esophagus NOS
K22.71 Barrett's esophagus with dysplasia
K22.710 Barrett's esophagus with low grade dysplasia
K22.711 Barrett's esophagus with high grade dysplasia
K22.719 Barrett's esophagus with dysplasia, unspecified
K22.8 Other specified diseases of esophagus
Excludes2 esophageal varices (I85.-)
Paterson-Kelly syndrome (D50.1)
K22.81 Esophageal polyp
Excludes1 benign neoplasm of esophagus (D13.0)
K22.82 Esophagogastric junction polyp
Excludes1 benign neoplasm of stomach (D13.1)
K22.89 Other specified disease of esophagus
Hemorrhage of esophagus NOS
K22.9 Disease of esophagus, unspecified
K23 Disorders of esophagus in diseases classified elsewhere
CodeFirst underlying disease, such as:
congenital syphilis (A50.5)
Excludes1 late syphilis (A52.79)
megaesophagus due to Chagas' disease (B57.31)
tuberculosis (A18.83)
nonPrimary Yes
K25 Gastric ulcer
Includes erosion (acute) of stomach
pylorus ulcer (peptic)
stomach ulcer (peptic)
UseAdditionalCode code to identify:
alcohol abuse and dependence (F10.-)
Excludes1 acute gastritis (K29.0-)
peptic ulcer NOS (K27.-)
K25.0 Acute gastric ulcer with hemorrhage
K25.1 Acute gastric ulcer with perforation
K25.2 Acute gastric ulcer with both hemorrhage and perforation
K25.3 Acute gastric ulcer without hemorrhage or perforation
K25.4 Chronic or unspecified gastric ulcer with hemorrhage
K25.5 Chronic or unspecified gastric ulcer with perforation
K25.6 Chronic or unspecified gastric ulcer with both hemorrhage and perforation
K25.7 Chronic gastric ulcer without hemorrhage or perforation
K25.9 Gastric ulcer, unspecified as acute or chronic, without hemorrhage or perforation
K26 Duodenal ulcer
Includes erosion (acute) of duodenum
duodenum ulcer (peptic)
postpyloric ulcer (peptic)
UseAdditionalCode code to identify:
alcohol abuse and dependence (F10.-)
Excludes1 peptic ulcer NOS (K27.-)
K26.0 Acute duodenal ulcer with hemorrhage
K26.1 Acute duodenal ulcer with perforation
K26.2 Acute duodenal ulcer with both hemorrhage and perforation
K26.3 Acute duodenal ulcer without hemorrhage or perforation
K26.4 Chronic or unspecified duodenal ulcer with hemorrhage
K26.5 Chronic or unspecified duodenal ulcer with perforation
K26.6 Chronic or unspecified duodenal ulcer with both hemorrhage and perforation
K26.7 Chronic duodenal ulcer without hemorrhage or perforation
K26.9 Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation
K27 Peptic ulcer, site unspecified
Includes gastroduodenal ulcer NOS
peptic ulcer NOS
UseAdditionalCode code to identify:
alcohol abuse and dependence (F10.-)
Excludes1 peptic ulcer of newborn (P78.82)
K27.0 Acute peptic ulcer, site unspecified, with hemorrhage
K27.1 Acute peptic ulcer, site unspecified, with perforation
K27.2 Acute peptic ulcer, site unspecified, with both hemorrhage and perforation
K27.3 Acute peptic ulcer, site unspecified, without hemorrhage or perforation
K27.4 Chronic or unspecified peptic ulcer, site unspecified, with hemorrhage
K27.5 Chronic or unspecified peptic ulcer, site unspecified, with perforation
K27.6 Chronic or unspecified peptic ulcer, site unspecified, with both hemorrhage and perforation
K27.7 Chronic peptic ulcer, site unspecified, without hemorrhage or perforation
K27.9 Peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation
K28 Gastrojejunal ulcer
Includes anastomotic ulcer (peptic) or erosion
gastrocolic ulcer (peptic) or erosion
gastrointestinal ulcer (peptic) or erosion
gastrojejunal ulcer (peptic) or erosion
jejunal ulcer (peptic) or erosion
marginal ulcer (peptic) or erosion
stomal ulcer (peptic) or erosion
UseAdditionalCode code to identify:
alcohol abuse and dependence (F10.-)
Excludes1 primary ulcer of small intestine (K63.3)
K28.0 Acute gastrojejunal ulcer with hemorrhage
K28.1 Acute gastrojejunal ulcer with perforation
K28.2 Acute gastrojejunal ulcer with both hemorrhage and perforation
K28.3 Acute gastrojejunal ulcer without hemorrhage or perforation
K28.4 Chronic or unspecified gastrojejunal ulcer with hemorrhage
K28.5 Chronic or unspecified gastrojejunal ulcer with perforation
K28.6 Chronic or unspecified gastrojejunal ulcer with both hemorrhage and perforation
K28.7 Chronic gastrojejunal ulcer without hemorrhage or perforation
K28.9 Gastrojejunal ulcer, unspecified as acute or chronic, without hemorrhage or perforation
K29 Gastritis and duodenitis
Excludes1 eosinophilic gastritis or gastroenteritis (K52.81)
Zollinger-Ellison syndrome (E16.4)
K29.0 Acute gastritis
UseAdditionalCode code to identify:
alcohol abuse and dependence (F10.-)
Excludes1 erosion (acute) of stomach (K25.-)
K29.00 Acute gastritis without bleeding
K29.01 Acute gastritis with bleeding
K29.2 Alcoholic gastritis
UseAdditionalCode code to identify:
alcohol abuse and dependence (F10.-)
K29.20 Alcoholic gastritis without bleeding
K29.21 Alcoholic gastritis with bleeding
K29.3 Chronic superficial gastritis
K29.30 Chronic superficial gastritis without bleeding
K29.31 Chronic superficial gastritis with bleeding
K29.4 Chronic atrophic gastritis
Gastric atrophy
K29.40 Chronic atrophic gastritis without bleeding
K29.41 Chronic atrophic gastritis with bleeding
K29.5 Unspecified chronic gastritis
Chronic antral gastritis
Chronic fundal gastritis
K29.50 Unspecified chronic gastritis without bleeding
K29.51 Unspecified chronic gastritis with bleeding
K29.6 Other gastritis
Giant hypertrophic gastritis
Granulomatous gastritis
Ménétrier's disease
K29.60 Other gastritis without bleeding
K29.61 Other gastritis with bleeding
K29.7 Gastritis, unspecified
K29.70 Gastritis, unspecified, without bleeding
K29.71 Gastritis, unspecified, with bleeding
K29.8 Duodenitis
K29.80 Duodenitis without bleeding
K29.81 Duodenitis with bleeding
K29.9 Gastroduodenitis, unspecified
K29.90 Gastroduodenitis, unspecified, without bleeding
K29.91 Gastroduodenitis, unspecified, with bleeding
K30 Functional dyspepsia
Indigestion
Excludes1 dyspepsia NOS (R10.13)
heartburn (R12)
nervous dyspepsia (F45.8)
neurotic dyspepsia (F45.8)
psychogenic dyspepsia (F45.8)
K31 Other diseases of stomach and duodenum
Includes functional disorders of stomach
Excludes2 diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43)
diverticulum of duodenum (K57.00-K57.13)
K31.0 Acute dilatation of stomach
Acute distention of stomach
K31.1 Adult hypertrophic pyloric stenosis
Pyloric stenosis NOS
Excludes1 congenital or infantile pyloric stenosis (Q40.0)
age Adult: [15-124]
K31.2 Hourglass stricture and stenosis of stomach
Excludes1 congenital hourglass stomach (Q40.2)
hourglass contraction of stomach (K31.89)
K31.3 Pylorospasm, not elsewhere classified
Excludes1 congenital or infantile pylorospasm (Q40.0)
neurotic pylorospasm (F45.8)
psychogenic pylorospasm (F45.8)
K31.4 Gastric diverticulum
Excludes1 congenital diverticulum of stomach (Q40.2)
K31.5 Obstruction of duodenum
Constriction of duodenum
Duodenal ileus (chronic)
Stenosis of duodenum
Stricture of duodenum
Volvulus of duodenum
Excludes1 congenital stenosis of duodenum (Q41.0)
K31.6 Fistula of stomach and duodenum
Gastrocolic fistula
Gastrojejunocolic fistula
CodeAlso , if applicable, disruption of internal operation (surgical) wound (T81.32-)
K31.7 Polyp of stomach and duodenum
Excludes1 adenomatous polyp of stomach (D13.1)
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
Angiodysplasia of stomach and duodenum NOS
K31.82 Dieulafoy lesion (hemorrhagic) of stomach and duodenum
Excludes2 Dieulafoy lesion of intestine (K63.81)
K31.83 Achlorhydria
K31.84 Gastroparesis
Gastroparalysis
CodeFirst underlying disease, if known, such as:
anorexia nervosa (F50.0-)
diabetes mellitus (E08.43, E09.43, E10.43, E11.43, E13.43)
scleroderma (M34.-)
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
Gastric intestinal metaplasia indefinite for dysplasia
Gastric intestinal metaplasia NOS
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