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

Rules Conventions GCS DChS.XI.1

Other diseases of intestines
(K55-K64)

K55 Vascular disorders of intestine

Excl.:
necrotizing enterocolitis of fetus or newborn ( P77)
K55.0 Acute vascular disorders of intestine
Incl.:
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
Incl.:
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
Incl.:
  • Ischaemic:
    • colitis
    • enteritis
    • enterocolitis
  • NOS

K56 Paralytic ileus and intestinal obstruction without hernia

Excl.:
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
Incl.:
Paralysis of:
  • bowel
  • colon
  • intestine
Excl.:
gallstone ileus ( K56.3)
ileus NOS ( K56.7)
obstructive ileus NOS ( K56.6)
K56.1 Intussusception
Incl.:
Intussusception or invagination of:
  • bowel
  • colon
  • intestine
  • rectum
Excl.:
intussusception of appendix ( K38.8)
K56.2 Volvulus
Incl.:
  • Strangulation
  • Torsion
  • Twist
  • of colon or intestine
K56.3 Gallstone ileus
Incl.:
Obstruction of intestine by gallstone
K56.4 Other impaction of intestine
Incl.:
Enterolith
Impaction (of):
  • colon
  • faecal
K56.5 Intestinal adhesions [bands] with obstruction
Incl.:
Peritoneal adhesions [bands] with intestinal obstruction
K56.6 Other and unspecified intestinal obstruction
Incl.:
Enterostenosis
Obstructive ileus NOS
  • Occlusion
  • Stenosis
  • Stricture
  • of colon or intestine
Excl.:
other and unspecified neonatal intestinal obstruction classifiable to P76.8, P76.9
K56.7 Ileus, unspecified

K57 Diverticular disease of intestine

Incl.:
  • diverticulitis
  • diverticulosis
  • diverticulum
  • of (small)(large) intestine
Excl.:
congenital diverticulum of intestine ( Q43.8)
diverticulum of appendix ( K38.2)
Meckel diverticulum ( Q43.0)
K57.0 Diverticular disease of small intestine with perforation and abscess
Incl.:
Diverticular disease of small intestine with peritonitis
Excl.:
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
Incl.:
Diverticular disease of small intestine NOS
Excl.:
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
Incl.:
Diverticular disease of colon with peritonitis
Excl.:
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
Incl.:
Diverticular disease of colon NOS
Excl.:
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
Incl.:
Diverticular disease of both small and large intestine with peritonitis
K57.5 Diverticular disease of both small and large intestine without perforation or abscess
Incl.:
Diverticular disease of both small and large intestine NOS
K57.8 Diverticular disease of intestine, part unspecified, with perforation and abscess
Incl.:
Diverticular disease of intestine NOS with peritonitis
K57.9 Diverticular disease of intestine, part unspecified, without perforation or abscess
Incl.:
Diverticular disease of intestine NOS

K58 Irritable bowel syndrome

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

K59 Other functional intestinal disorders

Excl.:
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
Incl.:
Dilatation of colon
Toxic megacolon
Coding-Hint
Use additional external cause code (Chapter XX), if desired, to identify toxic agent.
Excl.:
megacolon (due to) (in):
  • Chagas disease (B57.3)
  • Clostridium difficile (A04.7)
  • congenital (aganglionic) (Q43.1)
  • Hirschsprung disease (Q43.1)
K59.4 Anal spasm
Incl.:
Proctalgia fugax
K59.8 Other specified functional intestinal disorders
Incl.:
Atony of colon
K59.9 Functional intestinal disorder, unspecified

K60 Fissure and fistula of anal and rectal regions

Excl.:
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
Incl.:
Fistula of rectum to skin
Excl.:
fistula:
K60.5 Anorectal fistula

K61 Abscess of anal and rectal regions

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

K62 Other diseases of anus and rectum

Incl.:
anal canal
Excl.:
colostomy and enterostomy malfunction ( K91.4)
faecal incontinence ( R15)
haemorrhoids (K64.-)
ulcerative proctitis ( K51.2)
K62.0 Anal polyp
K62.1 Rectal polyp
Excl.:
adenomatous polyp ( D12.8)
K62.2 Anal prolapse
Incl.:
Prolapse of anal canal
K62.3 Rectal prolapse
Incl.:
Prolapse of rectal mucosa
K62.4 Stenosis of anus and rectum
Incl.:
Stricture of anus (sphincter)
K62.5 Haemorrhage of anus and rectum
DCS.XI.7
Excl.:
neonatal rectal haemorrhage ( P54.2)
K62.6 Ulcer of anus and rectum
Incl.:
Ulcer:
  • solitary
  • stercoral
Excl.:
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
Incl.:
Proctitis NOS
K62.9 Disease of anus and rectum, unspecified

K63 Other diseases of intestine

K63.0 Abscess of intestine
Excl.:
abscess of:
  • anal and rectal regions (K61.-)
  • appendix (K35.3)
with diverticular disease ( K57.-)
K63.1 Perforation of intestine (nontraumatic)
Excl.:
perforation (nontraumatic) of:
with diverticular disease ( K57.-)
K63.2 Fistula of intestine
Excl.:
fistula (of):
K63.3 Ulcer of intestine
Incl.:
Primary ulcer of small intestine
Excl.:
ulcer (of):
ulcerative colitis ( K51.-)
K63.4 Enteroptosis
K63.5 Polyp of colon
Excl.:
adenomatous polyp of colon ( D12.6)
polyposis of colon ( D12.6)
K63.8 Other specified diseases of intestine
K63.9 Disease of intestine, unspecified

K64 Haemorrhoids and perianal venous thrombosis
DCS.XI.10

Incl.:
piles
Excl.:
complicating:
  • childbirth and the puerperium (O87.2)
  • pregnancy (O22.4)
K64.0 First degree haemorrhoids
Incl.:
Grade/stage I haemorrhoids
Haemorrhoids (bleeding) without prolapse outside of anal canal
K64.1 Second degree haemorrhoids
Incl.:
Grade/stage II haemorrhoids
Haemorrhoids (bleeding) that prolapse with straining, but retract spontaneously
K64.2 Third degree haemorrhoids
Incl.:
Grade/stage III haemorrhoids
Haemorrhoids (bleeding) that prolapse with straining and require manual replacement back inside anal canal
K64.3 Fourth degree haemorrhoids
Incl.:
Grade/stage IV haemorrhoids
Haemorrhoids (bleeding) with prolapsed tissue that cannot be manually replaced
K64.4 Residual haemorrhoidal skin tags
Incl.:
Skin tags of anus
K64.5 Perianal venous thrombosis
Incl.:
Perianal haematoma
K64.8 Other specified haemorrhoids
K64.9 Haemorrhoids, unspecified
Incl.:
Haemorrhoids (bleeding):
  • NOS
  • without mention of degree