Other diseases of intestines (K55-K64)

Browse all the diagnosis codes used for other diseases of intestines (k55-k64). For easy navigation, the diagnosis codes are sorted in alphabetical order and grouped by sections. Each section is clearly marked with its description, and the corresponding three-digit code range. This format makes it simple to browse diagnosis codes in this chapter or section and find what you're looking for. We've also added green checkmark icons to label billable codes, and red warning icons for non-billable ones. This makes it easy to identify which codes can be billed.

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Diseases of the digestive system (K00–K95)
- Other diseases of intestines (K55-K64)
  - - K55 Vascular disorders of intestine
    - K55.0 Acute vascular disorders of intestine
    - K55.01 Acute (reversible) ischemia of small intestine
    - K55.011 Focal (segmental) acute (reversible) ischemia of small intestine
    - K55.012 Diffuse acute (reversible) ischemia of small intestine
    - K55.019 Acute (reversible) ischemia of small intestine, extent unspecified
    - K55.02 Acute infarction of small intestine
    - K55.021 Focal (segmental) acute infarction of small intestine
    - K55.022 Diffuse acute infarction of small intestine
    - K55.029 Acute infarction of small intestine, extent unspecified
    - K55.03 Acute (reversible) ischemia of large intestine
    - K55.031 Focal (segmental) acute (reversible) ischemia of large intestine
    - K55.032 Diffuse acute (reversible) ischemia of large intestine
    - K55.039 Acute (reversible) ischemia of large intestine, extent unspecified
    - K55.04 Acute infarction of large intestine
    - K55.041 Focal (segmental) acute infarction of large intestine
    - K55.042 Diffuse acute infarction of large intestine
    - K55.049 Acute infarction of large intestine, extent unspecified
    - K55.05 Acute (reversible) ischemia of intestine, part unspecified
    - K55.051 Focal (segmental) acute (reversible) ischemia of intestine, part unspecified
    - K55.052 Diffuse acute (reversible) ischemia of intestine, part unspecified
    - K55.059 Acute (reversible) ischemia of intestine, part and extent unspecified
    - K55.06 Acute infarction of intestine, part unspecified
    - K55.061 Focal (segmental) acute infarction of intestine, part unspecified
    - K55.062 Diffuse acute infarction of intestine, part unspecified
    - K55.069 Acute infarction of intestine, part and extent unspecified
    - K55.1 Chronic vascular disorders of intestine
    - K55.2 Angiodysplasia of colon
    - K55.20 Angiodysplasia of colon without hemorrhage
    - K55.21 Angiodysplasia of colon with hemorrhage
    - K55.3 Necrotizing enterocolitis
    - K55.30 Necrotizing enterocolitis, unspecified
    - K55.31 Stage 1 necrotizing enterocolitis
    - K55.32 Stage 2 necrotizing enterocolitis
    - K55.33 Stage 3 necrotizing enterocolitis
    - K55.8 Other vascular disorders of intestine
    - K55.9 Vascular disorder of intestine, unspecified
  - - K56 Paralytic ileus and intestinal obstruction without hernia
    - K56.0 Paralytic ileus
    - K56.1 Intussusception
    - K56.2 Volvulus
    - K56.3 Gallstone ileus
    - K56.4 Other impaction of intestine
    - K56.41 Fecal impaction
    - K56.49 Other impaction of intestine
    - K56.5 Intestinal adhesions [bands] with obstruction (postinfection)
    - K56.50 Intestinal adhesions [bands], unspecified as to partial versus complete obstruction
    - K56.51 Intestinal adhesions [bands], with partial obstruction
    - K56.52 Intestinal adhesions [bands] with complete obstruction
    - K56.6 Other and unspecified intestinal obstruction
    - K56.60 Unspecified intestinal obstruction
    - K56.600 Partial intestinal obstruction, unspecified as to cause
    - K56.601 Complete intestinal obstruction, unspecified as to cause
    - K56.609 Unspecified intestinal obstruction, unspecified as to partial versus complete obstruction
    - K56.69 Other intestinal obstruction
    - K56.690 Other partial intestinal obstruction
    - K56.691 Other complete intestinal obstruction
    - K56.699 Other intestinal obstruction unspecified as to partial versus complete obstruction
    - K56.7 Ileus, unspecified
  - - K57 Diverticular disease of intestine
    - K57.0 Diverticulitis of small intestine with perforation and abscess
    - K57.00 Diverticulitis of small intestine with perforation and abscess without bleeding
    - K57.01 Diverticulitis of small intestine with perforation and abscess with bleeding
    - K57.1 Diverticular disease of small intestine without perforation or abscess
    - K57.10 Diverticulosis of small intestine without perforation or abscess without bleeding
    - K57.11 Diverticulosis of small intestine without perforation or abscess with bleeding
    - K57.12 Diverticulitis of small intestine without perforation or abscess without bleeding
    - K57.13 Diverticulitis of small intestine without perforation or abscess with bleeding
    - K57.2 Diverticulitis of large intestine with perforation and abscess
    - K57.20 Diverticulitis of large intestine with perforation and abscess without bleeding
    - K57.21 Diverticulitis of large intestine with perforation and abscess with bleeding
    - K57.3 Diverticular disease of large intestine without perforation or abscess
    - K57.30 Diverticulosis of large intestine without perforation or abscess without bleeding
    - K57.31 Diverticulosis of large intestine without perforation or abscess with bleeding
    - K57.32 Diverticulitis of large intestine without perforation or abscess without bleeding
    - K57.33 Diverticulitis of large intestine without perforation or abscess with bleeding
    - K57.4 Diverticulitis of both small and large intestine with perforation and abscess
    - K57.40 Diverticulitis of both small and large intestine with perforation and abscess without bleeding
    - K57.41 Diverticulitis of both small and large intestine with perforation and abscess with bleeding
    - K57.5 Diverticular disease of both small and large intestine without perforation or abscess
    - K57.50 Diverticulosis of both small and large intestine without perforation or abscess without bleeding
    - K57.51 Diverticulosis of both small and large intestine without perforation or abscess with bleeding
    - K57.52 Diverticulitis of both small and large intestine without perforation or abscess without bleeding
    - K57.53 Diverticulitis of both small and large intestine without perforation or abscess with bleeding
    - K57.8 Diverticulitis of intestine, part unspecified, with perforation and abscess
    - K57.80 Diverticulitis of intestine, part unspecified, with perforation and abscess without bleeding
    - K57.81 Diverticulitis of intestine, part unspecified, with perforation and abscess with bleeding
    - K57.9 Diverticular disease of intestine, part unspecified, without perforation or abscess
    - K57.90 Diverticulosis of intestine, part unspecified, without perforation or abscess without bleeding
    - K57.91 Diverticulosis of intestine, part unspecified, without perforation or abscess with bleeding
    - K57.92 Diverticulitis of intestine, part unspecified, without perforation or abscess without bleeding
    - K57.93 Diverticulitis of intestine, part unspecified, without perforation or abscess with bleeding
  - - K58 Irritable bowel syndrome
    - K58.0 Irritable bowel syndrome with diarrhea
    - K58.1 Irritable bowel syndrome with constipation
    - K58.2 Mixed irritable bowel syndrome
    - K58.8 Other irritable bowel syndrome
    - K58.9 Irritable bowel syndrome, unspecified UPDATED CODE
  - - K59 Other functional intestinal disorders
    - K59.0 Constipation
    - K59.00 Constipation, unspecified
    - K59.01 Slow transit constipation
    - K59.02 Outlet dysfunction constipation
    - K59.03 Drug induced constipation
    - K59.04 Chronic idiopathic constipation
    - K59.09 Other constipation
    - K59.1 Functional diarrhea
    - K59.2 Neurogenic bowel, not elsewhere classified
    - K59.3 Megacolon, not elsewhere classified
    - K59.31 Toxic megacolon
    - K59.39 Other megacolon
    - K59.4 Anal spasm
    - K59.8 Other specified functional intestinal disorders
    - K59.81 Ogilvie syndrome
    - K59.89 Other specified functional intestinal disorders
    - K59.9 Functional intestinal disorder, unspecified
  - - K60 Fissure and fistula of anal and rectal regions
    - K60.0 Acute anal fissure
    - K60.1 Chronic anal fissure
    - K60.2 Anal fissure, unspecified
    - K60.3 Anal fistula DELETED CODE
    - K60.30 Anal fistula, unspecified NEW CODE
    - K60.31 Anal fistula, simple
    - K60.311 Anal fistula, simple, initial NEW CODE
    - K60.312 Anal fistula, simple, persistent NEW CODE
    - K60.313 Anal fistula, simple, recurrent NEW CODE
    - K60.319 Anal fistula, simple, unspecified NEW CODE
    - K60.32 Anal fistula, complex
    - K60.321 Anal fistula, complex, initial NEW CODE
    - K60.322 Anal fistula, complex, persistent NEW CODE
    - K60.323 Anal fistula, complex, recurrent NEW CODE
    - K60.329 Anal fistula, complex, unspecified NEW CODE
    - K60.4 Rectal fistula DELETED CODE
    - K60.40 Rectal fistula, unspecified NEW CODE
    - K60.41 Rectal fistula, simple
    - K60.411 Rectal fistula, simple, initial NEW CODE
    - K60.412 Rectal fistula, simple, persistent NEW CODE
    - K60.413 Rectal fistula, simple, recurrent NEW CODE
    - K60.419 Rectal fistula, simple, unspecified NEW CODE
    - K60.42 Rectal fistula, complex
    - K60.421 Rectal fistula, complex, initial NEW CODE
    - K60.422 Rectal fistula, complex, persistent NEW CODE
    - K60.423 Rectal fistula, complex, recurrent NEW CODE
    - K60.429 Rectal fistula, complex, unspecified NEW CODE
    - K60.5 Anorectal fistula DELETED CODE
    - K60.50 Anorectal fistula, unspecified NEW CODE
    - K60.51 Anorectal fistula, simple
    - K60.511 Anorectal fistula, simple, initial NEW CODE
    - K60.512 Anorectal fistula, simple, persistent NEW CODE
    - K60.513 Anorectal fistula, simple, recurrent NEW CODE
    - K60.519 Anorectal fistula, simple, unspecified NEW CODE
    - K60.52 Anorectal fistula, complex
    - K60.521 Anorectal fistula, complex, initial NEW CODE
    - K60.522 Anorectal fistula, complex, persistent NEW CODE
    - K60.523 Anorectal fistula, complex, recurrent NEW CODE
    - K60.529 Anorectal fistula, complex, unspecified NEW CODE
  - - K61 Abscess of anal and rectal regions
    - K61.0 Anal abscess
    - K61.1 Rectal abscess
    - K61.2 Anorectal abscess
    - K61.3 Ischiorectal abscess
    - K61.31 Horseshoe abscess
    - K61.39 Other ischiorectal abscess
    - K61.4 Intrasphincteric abscess
    - K61.5 Supralevator abscess
  - - K62 Other diseases of anus and rectum
    - K62.0 Anal polyp
    - K62.1 Rectal polyp
    - K62.2 Anal prolapse
    - K62.3 Rectal prolapse
    - K62.4 Stenosis of anus and rectum
    - K62.5 Hemorrhage of anus and rectum
    - K62.6 Ulcer of anus and rectum
    - K62.7 Radiation proctitis
    - K62.8 Other specified diseases of anus and rectum
    - K62.81 Anal sphincter tear (healed) (nontraumatic) (old)
    - K62.82 Dysplasia of anus
    - K62.89 Other specified diseases of anus and rectum
    - K62.9 Disease of anus and rectum, unspecified
  - - K63 Other diseases of intestine
    - K63.0 Abscess of intestine
    - K63.1 Perforation of intestine (nontraumatic)
    - K63.2 Fistula of intestine
    - K63.3 Ulcer of intestine
    - K63.4 Enteroptosis
    - K63.5 Polyp of colon
    - K63.8 Other specified diseases of intestine
    - K63.81 Dieulafoy lesion of intestine
    - K63.82 Intestinal microbial overgrowth
    - K63.821 Small intestinal bacterial overgrowth
    - K63.8211 Small intestinal bacterial overgrowth, hydrogen-subtype
    - K63.8212 Small intestinal bacterial overgrowth, hydrogen sulfide-subtype
    - K63.8219 Small intestinal bacterial overgrowth, unspecified
    - K63.822 Small intestinal fungal overgrowth
    - K63.829 Intestinal methanogen overgrowth, unspecified
    - K63.89 Other specified diseases of intestine
    - K63.9 Disease of intestine, unspecified
  - - K64 Hemorrhoids and perianal venous thrombosis
    - K64.0 First degree hemorrhoids
    - K64.1 Second degree hemorrhoids
    - K64.2 Third degree hemorrhoids
    - K64.3 Fourth degree hemorrhoids
    - K64.4 Residual hemorrhoidal skin tags
    - K64.5 Perianal venous thrombosis
    - K64.8 Other hemorrhoids
    - K64.9 Unspecified hemorrhoids

Diseases of the digestive system (K00–K95)

Other diseases of intestines (K55-K64)

Vascular disorders of intestine (K55)

K55 Vascular disorders of intestine

K55.0 Acute vascular disorders of intestine

K55.01 Acute (reversible) ischemia of small intestine

K55.02 Acute infarction of small intestine

K55.03 Acute (reversible) ischemia of large intestine

K55.04 Acute infarction of large intestine

K55.05 Acute (reversible) ischemia of intestine, part unspecified

K55.06 Acute infarction of intestine, part unspecified

K55.2 Angiodysplasia of colon

K55.3 Necrotizing enterocolitis

Paralytic ileus and intestinal obstruction without hernia (K56)

K56 Paralytic ileus and intestinal obstruction without hernia

K56.4 Other impaction of intestine

K56.5 Intestinal adhesions [bands] with obstruction (postinfection)

K56.6 Other and unspecified intestinal obstruction

K56.60 Unspecified intestinal obstruction

K56.69 Other intestinal obstruction

Diverticular disease of intestine (K57)

K57 Diverticular disease of intestine

K57.0 Diverticulitis of small intestine with perforation and abscess

K57.1 Diverticular disease of small intestine without perforation or abscess

K57.2 Diverticulitis of large intestine with perforation and abscess

K57.3 Diverticular disease of large intestine without perforation or abscess

K57.4 Diverticulitis of both small and large intestine with perforation and abscess

K57.5 Diverticular disease of both small and large intestine without perforation or abscess

K57.8 Diverticulitis of intestine, part unspecified, with perforation and abscess

K57.9 Diverticular disease of intestine, part unspecified, without perforation or abscess

Irritable bowel syndrome (K58)

K58 Irritable bowel syndrome

Other functional intestinal disorders (K59)

K59 Other functional intestinal disorders

K59.0 Constipation

K59.3 Megacolon, not elsewhere classified

K59.8 Other specified functional intestinal disorders

Fissure and fistula of anal and rectal regions (K60)

K60 Fissure and fistula of anal and rectal regions

K60.3 Anal fistula DELETED CODE

K60.31 Anal fistula, simple

K60.32 Anal fistula, complex

K60.4 Rectal fistula DELETED CODE

K60.41 Rectal fistula, simple

K60.42 Rectal fistula, complex

K60.5 Anorectal fistula DELETED CODE

K60.51 Anorectal fistula, simple

K60.52 Anorectal fistula, complex

Abscess of anal and rectal regions (K61)

K61 Abscess of anal and rectal regions

K61.3 Ischiorectal abscess

Other diseases of anus and rectum (K62)

K62 Other diseases of anus and rectum

K62.8 Other specified diseases of anus and rectum

Other diseases of intestine (K63)

K63 Other diseases of intestine

K63.8 Other specified diseases of intestine

K63.82 Intestinal microbial overgrowth

K63.821 Small intestinal bacterial overgrowth

Hemorrhoids and perianal venous thrombosis (K64)

K64 Hemorrhoids and perianal venous thrombosis