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

Other diseases of intestines
(K55-K63)

K55 Vascular disorders of intestine
Excludes: necrotizing enterocolitis of fetus or newborn ( P77 )
K55.0 Acute vascular disorders of intestine
Acute:
· fulminant ischaemic colitis
· intestinal infarction
· small intestine ischaemia
Mesenteric (artery)(vein):
· embolism
· infarction
· thrombosis
Subacute ischaemic colitis
K55.1 Chronic vascular disorders of intestine
Chronic ischaemic:
· colitis
· enteritis
· enterocolitis
Ischaemic stricture of intestine
Mesenteric:
· atherosclerosis
· vascular insufficiency
K55.2 Angiodysplasia of colon
K55.8 Other vascular disorders of intestine
K55.9 Vascular disorder of intestine, unspecified
Ischaemic:
· colitis
· enteritis
· enterocolitis
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NOS

K56 Paralytic ileus and intestinal obstruction without hernia
Excludes: congenital stricture or stenosis of intestine ( Q41-Q42 )
ischaemic stricture of intestine ( K55.1 )
meconium ileus ( E84.1 )
obstruction of duodenum ( K31.5 )
postoperative intestinal obstruction ( K91.3 )
stenosis of anus or rectum ( K62.4 )
with hernia ( K40-K46 )
K56.0 Paralytic ileus
Paralysis of:
· bowel
· colon
· intestine
Excludes: gallstone ileus ( K56.3 )
ileus NOS ( K56.7 )
obstructive ileus NOS ( K56.6 )
K56.1 Intussusception
Intussusception or invagination of:
· bowel
· colon
· intestine
· rectum
Excludes: intussusception of appendix ( K38.8 )
K56.2 Volvulus
Strangulation
Torsion
Twist
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of colon or intestine
K56.3 Gallstone ileus
Obstruction of intestine by gallstone
K56.4 Other impaction of intestine
Enterolith
Impaction (of):
· colon
· faecal
K56.5 Intestinal adhesions [bands] with obstruction
Peritoneal adhesions [bands] with intestinal obstruction
K56.6 Other and unspecified intestinal obstruction
Enterostenosis
Obstructive ileus NOS
Occlusion
Stenosis
Stricture
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of colon or intestine
Excludes: other and unspecified neonatal intestinal obstruction classifiable to P76.8, P76.9
K56.7 Ileus, unspecified

K57 Diverticular disease of intestine
Includes: diverticulitis
diverticulosis
diverticulum
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of (small)(large) intestine
Excludes: congenital diverticulum of intestine ( Q43.8 )
diverticulum of appendix ( K38.2 )
Meckel's diverticulum ( Q43.0 )
K57.0 Diverticular disease of small intestine with perforation and abscess
Diverticular disease of small intestine with peritonitis
Excludes: diverticular disease of both small and large intestine with perforation and abscess ( K57.4 )
K57.1 Diverticular disease of small intestine without perforation or abscess
Diverticular disease of small intestine NOS
Excludes: diverticular disease of both small and large intestine without perforation or abscess ( K57.5 )
K57.2 Diverticular disease of large intestine with perforation and abscess
Diverticular disease of colon with peritonitis
Excludes: diverticular disease of both small and large intestine with perforation and abscess ( K57.4 )
K57.3 Diverticular disease of large intestine without perforation or abscess
Diverticular disease of colon NOS
Excludes: diverticular disease of both small and large intestine without perforation or abscess ( K57.5 )
K57.4 Diverticular disease of both small and large intestine with perforation and abscess
Diverticular disease of both small and large intestine with peritonitis
K57.5 Diverticular disease of both small and large intestine without perforation or abscess
Diverticular disease of both small and large intestine NOS
K57.8 Diverticular disease of intestine, part unspecified, with perforation and abscess
Diverticular disease of intestine NOS with peritonitis
K57.9 Diverticular disease of intestine, part unspecified, without perforation or abscess
Diverticular disease of intestine NOS

K58 Irritable bowel syndrome
Includes: irritable colon
K58.0 Irritable bowel syndrome with diarrhoea
K58.9 Irritable bowel syndrome without diarrhoea
Irritable bowel syndrome NOS

K59 Other functional intestinal disorders
Excludes: change in bowel habit NOS ( R19.4 )
functional disorders of stomach ( K31.- )
intestinal malabsorption ( K90.- )
psychogenic intestinal disorders ( F45.3 )
K59.0 Constipation
K59.1 Functional diarrhoea
K59.2 Neurogenic bowel, not elsewhere classified
K59.3 Megacolon, not elsewhere classified
Dilatation of colon
Toxic megacolon
Use additional external cause code (Chapter XX), if desired, to identify toxic agent.
Excludes: megacolon (in):
· Chagas' disease ( B57.3 )
· congenital (aganglionic) ( Q43.1 )
· Hirschsprung's disease ( Q43.1 )
K59.4 Anal spasm
Proctalgia fugax
K59.8 Other specified functional intestinal disorders
Atony of colon
K59.9 Functional intestinal disorder, unspecified

K60 Fissure and fistula of anal and rectal regions
Excludes: with abscess or cellulitis ( K61.- )
K60.0 Acute anal fissure
K60.1 Chronic anal fissure
K60.2 Anal fissure, unspecified
K60.3 Anal fistula
K60.4 Rectal fistula
Fistula of rectum to skin
Excludes: fistula:
· rectovaginal ( N82.3 )
· vesicorectal ( N32.1 )
K60.5 Anorectal fistula

K61 Abscess of anal and rectal regions
Includes: abscess
cellulitis
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of anal and rectal regions with or without fistula
K61.0 Anal abscess
Perianal abscess
Excludes: intrasphincteric abscess ( K61.4 )
K61.1 Rectal abscess
Perirectal abscess
Excludes: ischiorectal abscess ( K61.3 )
K61.2 Anorectal abscess
K61.3 Ischiorectal abscess
Abscess of ischiorectal fossa
K61.4 Intrasphincteric abscess

K62 Other diseases of anus and rectum
Includes: anal canal
Excludes: colostomy and enterostomy malfunction ( K91.4 )
faecal incontinence ( R15 )
haemorrhoids ( I84.- )
ulcerative proctitis ( K51.2 )
K62.0 Anal polyp
K62.1 Rectal polyp
Excludes: adenomatous polyp ( D12.8 )
K62.2 Anal prolapse
Prolapse of anal canal
K62.3 Rectal prolapse
Prolapse of rectal mucosa
K62.4 Stenosis of anus and rectum
Stricture of anus (sphincter)
K62.5 Haemorrhage of anus and rectum
Excludes: neonatal rectal haemorrhage ( P54.2 )
K62.6 Ulcer of anus and rectum
Ulcer:
· solitary
· stercoral
Excludes: fissure and fistula of anus and rectum ( K60.- )
in ulcerative colitis ( K51.- )
K62.7 Radiation proctitis
K62.8 Other specified diseases of anus and rectum
Proctitis NOS
K62.9 Disease of anus and rectum, unspecified

K63 Other diseases of intestine
K63.0 Abscess of intestine
Excludes: abscess of:
· anal and rectal regions ( K61.- )
· appendix ( K35.1 )
with diverticular disease ( K57.- )
K63.1 Perforation of intestine (nontraumatic)
Excludes: perforation (nontraumatic) of:
· appendix ( K35.0 )
· duodenum ( K26.- )
with diverticular disease ( K57.- )
K63.2 Fistula of intestine
Excludes: fistula (of):
· anal and rectal regions ( K60.- )
· appendix ( K38.3 )
· duodenum ( K31.6 )
· intestinal-genital, female ( N82.2-N82.4 )
· vesicointestinal ( N32.1 )
K63.3 Ulcer of intestine
Primary ulcer of small intestine
Excludes: ulcer (of):
· anus or rectum ( K62.6 )
· duodenal ( K26.- )
· gastrointestinal ( K28.- )
· gastrojejunal ( K28.- )
· jejunal ( K28.- )
· peptic, site unspecified ( K27.- )
ulcerative colitis ( K51.- )
K63.4 Enteroptosis
K63.5 Polyp of colon
Excludes: adenomatous polyp of colon ( D12.6 )
polyposis of colon ( D12.6 )
K63.8 Other specified diseases of intestine
K63.9 Disease of intestine, unspecified