Chapter XI
Diseases of the digestive system
(K00-K93)

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

Excludes: hiatus hernia ( K44.- )

K20 Oesophagitis
Abscess of oesophagus
Oesophagitis:
· NOS
· chemical
· peptic
Use additional external cause code (Chapter XX), if desired, to identify cause.
Excludes: erosion of oesophagus ( K22.1 )
reflux oesophagitis ( K21.0 )
with gastro-oesophageal reflux disease ( K21.0 )

K21 Gastro-oesophageal reflux disease
K21.0 Gastro-oesophageal reflux disease with oesophagitis
Reflux oesophagitis
K21.9 Gastro-oesophageal reflux disease without oesophagitis
Oesophageal reflux NOS

K22 Other diseases of oesophagus
Excludes: oesophageal varices ( I85.- )
K22.0 Achalasia of cardia
Achalasia NOS
Cardiospasm
Excludes: congenital cardiospasm ( Q39.5 )
K22.1 Ulcer of oesophagus
Erosion of oesophagus
Ulcer of oesophagus:
· NOS
· due to ingestion of:
  · chemicals
  · drugs and medicaments
· fungal
· peptic
Ulcerative oesophagitis
Use additional external cause code (Chapter XX), if desired, to identify cause.
K22.2 Oesophageal obstruction
Compression
Constriction
Stenosis
Stricture
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of oesophagus
Excludes: congenital stenosis or stricture of oesophagus ( Q39.3 )
K22.3 Perforation of oesophagus
Rupture of oesophagus
Excludes: traumatic perforation of (thoracic) oesophagus ( S27.8 )
K22.4 Dyskinesia of oesophagus
Corkscrew oesophagus
Diffuse oesophageal spasm
Spasm of oesophagus
Excludes: cardiospasm ( K22.0 )
K22.5 Diverticulum of oesophagus, acquired
Oesophageal pouch, acquired
Excludes: diverticulum of oesophagus (congenital) ( Q39.6 )
K22.6 Gastro-oesophageal laceration-haemorrhage syndrome
Mallory-Weiss syndrome
K22.7 Barrett's oesophagus
Barrett's:
· disease
· syndrome
Excludes: Barrett's ulcer ( K22.1 )
K22.8 Other specified diseases of oesophagus
Haemorrhage of oesophagus NOS
K22.9 Disease of oesophagus, unspecified

K23* Disorders of oesophagus in diseases classified elsewhere
K23.0* Tuberculous oesophagitis ( A18.8+ )
K23.1* Megaoesophagus in Chagas' disease ( B57.3+ )
K23.8* Disorders of oesophagus in other diseases classified elsewhere

The following fourth-character subdivisions are for use with categories K25-K28:
.0 Acute with haemorrhage
.1 Acute with perforation
.2 Acute with both haemorrhage and perforation
.3 Acute without haemorrhage or perforation
.4 Chronic or unspecified with haemorrhage
.5 Chronic or unspecified with perforation
.6 Chronic or unspecified with both haemorrhage and perforation
.7 Chronic without haemorrhage or perforation
.9 Unspecified as acute or chronic, without haemorrhage or perforation
K25 Gastric ulcer
[See before K25 for subdivisions ]
Includes: erosion (acute) of stomach
ulcer (peptic):
· pylorus
· stomach
Use additional external cause code (Chapter XX), if desired, to identify drug, if drug-induced.
Excludes: acute haemorrhagic erosive gastritis ( K29.0 )
peptic ulcer NOS ( K27.- )

K26 Duodenal ulcer
[See before K25 for subdivisions ]
Includes: erosion (acute) of duodenum
ulcer (peptic):
· duodenal
· postpyloric
Use additional external cause code (Chapter XX), if desired, to identify drug, if drug-induced.
Excludes: peptic ulcer NOS ( K27.- )

K27 Peptic ulcer, site unspecified
[See before K25 for subdivisions ]
Includes: gastroduodenal ulcer NOS
peptic ulcer NOS
Excludes: peptic ulcer of newborn ( P78.8 )

K28 Gastrojejunal ulcer
[See before K25 for subdivisions ]
Includes: ulcer (peptic) or erosion:
· anastomotic
· gastrocolic
· gastrointestinal
· gastrojejunal
· jejunal
· marginal
· stomal
Excludes: primary ulcer of small intestine ( K63.3 )

K29 Gastritis and duodenitis
Excludes: eosinophilic gastritis or gastroenteritis ( K52.8 )
Zollinger-Ellison syndrome ( E16.4 )
K29.0 Acute haemorrhagic gastritis
Acute (erosive) gastritis with haemorrhage
Excludes: erosion (acute) of stomach ( K25.- )
K29.1 Other acute gastritis
K29.2 Alcoholic gastritis
K29.3 Chronic superficial gastritis
K29.4 Chronic atrophic gastritis
Gastric atrophy
K29.5 Chronic gastritis, unspecified
Chronic gastritis:
· antral
· fundal
K29.6 Other gastritis
Giant hypertrophic gastritis
Granulomatous gastritis
Ménétrier's disease
K29.7 Gastritis, unspecified
K29.8 Duodenitis
K29.9 Gastroduodenitis, unspecified

K30 Dyspepsia
Indigestion
Excludes: dyspepsia:
· nervous ( F45.3 )
· neurotic ( F45.3 )
· psychogenic ( F45.3 )
heartburn ( R12 )

K31 Other diseases of stomach and duodenum
Includes: functional disorders of stomach
Excludes: diverticulum of duodenum ( K57.0-K57.1 )
gastrointestinal haemorrhage ( K92.0-K92.2 )
K31.0 Acute dilatation of stomach
Acute distension of stomach
K31.1 Adult hypertrophic pyloric stenosis
Pyloric stenosis NOS
Excludes: congenital or infantile pyloric stenosis ( Q40.0 )
K31.2 Hourglass stricture and stenosis of stomach
Excludes: congenital hourglass stomach ( Q40.2 )
hourglass contraction of stomach ( K31.8 )
K31.3 Pylorospasm, not elsewhere classified
Excludes: pylorospasm:
· congenital or infantile ( Q40.0 )
· neurotic ( F45.3 )
· psychogenic ( F45.3 )
K31.4 Gastric diverticulum
Excludes: congenital diverticulum of stomach ( Q40.2 )
K31.5 Obstruction of duodenum
Constriction
Stenosis
Stricture
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of duodenum
Duodenal ileus (chronic)
Excludes: congenital stenosis of duodenum ( Q41.0 )
K31.6 Fistula of stomach and duodenum
Gastrocolic fistula
Gastrojejunocolic fistula
K31.7 Polyp of stomach and duodenum
Excludes: adenomatous polyp of stomach ( D13.1 )
K31.8 Other specified diseases of stomach and duodenum
Achlorhydria
Gastroptosis
Hourglass contraction of stomach
K31.9 Disease of stomach and duodenum, unspecified