K55-K64Not billable, use a more specific code below
Other diseases of intestines (K55-K64)
chapter 11: Diseases of the Digestive System
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Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
There are no chapter-specific rules for Chapter 11 yet, so the general rules in Section I.B apply.
All codes under K55-K64
K55-K64 can't be used on a claim. Pick a billable code below; grey headings group them.
- K55Vascular disorders of intestine
- K55.0Acute vascular disorders of intestine
- K55.01Acute (reversible) ischemia of small intestine
- K55.011Focal (segmental) acute (reversible) ischemia of small intestine
- K55.012Diffuse acute (reversible) ischemia of small intestine
- K55.019Acute (reversible) ischemia of small intestine, extent unspecified
- K55.02Acute infarction of small intestine
- K55.021Focal (segmental) acute infarction of small intestine
- K55.022Diffuse acute infarction of small intestine
- K55.029Acute infarction of small intestine, extent unspecified
- K55.03Acute (reversible) ischemia of large intestine
- K55.031Focal (segmental) acute (reversible) ischemia of large intestine
- K55.032Diffuse acute (reversible) ischemia of large intestine
- K55.039Acute (reversible) ischemia of large intestine, extent unspecified
- K55.04Acute infarction of large intestine
- K55.041Focal (segmental) acute infarction of large intestine
- K55.042Diffuse acute infarction of large intestine
- K55.049Acute infarction of large intestine, extent unspecified
- K55.05Acute (reversible) ischemia of intestine, part unspecified
- K55.051Focal (segmental) acute (reversible) ischemia of intestine, part unspecified
- K55.052Diffuse acute (reversible) ischemia of intestine, part unspecified
- K55.059Acute (reversible) ischemia of intestine, part and extent unspecified
- K55.06Acute infarction of intestine, part unspecified
- K55.061Focal (segmental) acute infarction of intestine, part unspecified
- K55.062Diffuse acute infarction of intestine, part unspecified
- K55.069Acute infarction of intestine, part and extent unspecified
- K55.1Chronic vascular disorders of intestine
- K55.2Angiodysplasia of colon
- K55.20Angiodysplasia of colon without hemorrhage
- K55.21Angiodysplasia of colon with hemorrhage
- K55.3Necrotizing enterocolitis
- K55.30Necrotizing enterocolitis, unspecified
- K55.31Stage 1 necrotizing enterocolitis
- K55.32Stage 2 necrotizing enterocolitis
- K55.33Stage 3 necrotizing enterocolitis
- K55.8Other vascular disorders of intestine
- K55.9Vascular disorder of intestine, unspecified
- K56Paralytic ileus and intestinal obstruction without hernia
- K56.0Paralytic ileus
- K56.1Intussusception
- K56.2Volvulus
- K56.3Gallstone ileus
- K56.4Other impaction of intestine
- K56.41Fecal impaction
- K56.49Other impaction of intestine
- K56.5Intestinal adhesions [bands] with obstruction (postinfection)
- K56.50Intestinal adhesions [bands], unspecified as to partial versus complete obstruction
- K56.51Intestinal adhesions [bands], with partial obstruction
- K56.52Intestinal adhesions [bands] with complete obstruction
- K56.6Other and unspecified intestinal obstruction
- K56.60Unspecified intestinal obstruction
- K56.600Partial intestinal obstruction, unspecified as to cause
- K56.601Complete intestinal obstruction, unspecified as to cause
- K56.609Unspecified intestinal obstruction, unspecified as to partial versus complete obstruction
- K56.69Other intestinal obstruction
- K56.690Other partial intestinal obstruction
- K56.691Other complete intestinal obstruction
- K56.699Other intestinal obstruction unspecified as to partial versus complete obstruction
- K56.7Ileus, unspecified
- K57Diverticular disease of intestine
- K57.0Diverticulitis of small intestine with perforation and abscess
- K57.00Diverticulitis of small intestine with perforation and abscess without bleeding
- K57.01Diverticulitis of small intestine with perforation and abscess with bleeding
- K57.1Diverticular disease of small intestine without perforation or abscess
- K57.10Diverticulosis of small intestine without perforation or abscess without bleeding
- K57.11Diverticulosis of small intestine without perforation or abscess with bleeding
- K57.12Diverticulitis of small intestine without perforation or abscess without bleeding
- K57.13Diverticulitis of small intestine without perforation or abscess with bleeding
- K57.2Diverticulitis of large intestine with perforation and abscess
- K57.20Diverticulitis of large intestine with perforation and abscess without bleeding
- K57.21Diverticulitis of large intestine with perforation and abscess with bleeding
- K57.3Diverticular disease of large intestine without perforation or abscess
- K57.30Diverticulosis of large intestine without perforation or abscess without bleeding
- K57.31Diverticulosis of large intestine without perforation or abscess with bleeding
- K57.32Diverticulitis of large intestine without perforation or abscess without bleeding
- K57.33Diverticulitis of large intestine without perforation or abscess with bleeding
- K57.4Diverticulitis of both small and large intestine with perforation and abscess
- K57.40Diverticulitis of both small and large intestine with perforation and abscess without bleeding
- K57.41Diverticulitis of both small and large intestine with perforation and abscess with bleeding
- K57.5Diverticular disease of both small and large intestine without perforation or abscess
- K57.50Diverticulosis of both small and large intestine without perforation or abscess without bleeding
- K57.51Diverticulosis of both small and large intestine without perforation or abscess with bleeding
- K57.52Diverticulitis of both small and large intestine without perforation or abscess without bleeding
- K57.53Diverticulitis of both small and large intestine without perforation or abscess with bleeding
- K57.8Diverticulitis of intestine, part unspecified, with perforation and abscess
- K57.80Diverticulitis of intestine, part unspecified, with perforation and abscess without bleeding
- K57.81Diverticulitis of intestine, part unspecified, with perforation and abscess with bleeding
- K57.9Diverticular disease of intestine, part unspecified, without perforation or abscess
- K57.90Diverticulosis of intestine, part unspecified, without perforation or abscess without bleeding
- K57.91Diverticulosis of intestine, part unspecified, without perforation or abscess with bleeding
- K57.92Diverticulitis of intestine, part unspecified, without perforation or abscess without bleeding
- K57.93Diverticulitis of intestine, part unspecified, without perforation or abscess with bleeding
- K58Irritable bowel syndrome
- K58.0Irritable bowel syndrome with diarrhea
- K58.1Irritable bowel syndrome with constipation
- K58.2Mixed irritable bowel syndrome
- K58.8Other irritable bowel syndrome
- K58.9Irritable bowel syndrome, unspecified
- K59Other functional intestinal disorders
- K59.0Constipation
- K59.00Constipation, unspecified
- K59.01Slow transit constipation
- K59.02Outlet dysfunction constipation
- K59.03Drug induced constipation
- K59.04Chronic idiopathic constipation
- K59.09Other constipation
- K59.1Functional diarrhea
- K59.2Neurogenic bowel, not elsewhere classified
- K59.3Megacolon, not elsewhere classified
- K59.31Toxic megacolon
- K59.39Other megacolon
- K59.4Anal spasm
- K59.8Other specified functional intestinal disorders
- K59.81Ogilvie syndrome
- K59.89Other specified functional intestinal disorders
- K59.9Functional intestinal disorder, unspecified
- K60Fissure and fistula of anal and rectal regions
- K60.0Acute anal fissure
- K60.1Chronic anal fissure
- K60.2Anal fissure, unspecified
- K60.3Anal fistula
- K60.30Anal fistula, unspecified
- K60.31Anal fistula, simple
- K60.311Anal fistula, simple, initial
- K60.312Anal fistula, simple, persistent
- K60.313Anal fistula, simple, recurrent
- K60.319Anal fistula, simple, unspecified
- K60.32Anal fistula, complex
- K60.321Anal fistula, complex, initial
- K60.322Anal fistula, complex, persistent
- K60.323Anal fistula, complex, recurrent
- K60.329Anal fistula, complex, unspecified
- K60.4Rectal fistula
- K60.40Rectal fistula, unspecified
- K60.41Rectal fistula, simple
- K60.411Rectal fistula, simple, initial
- K60.412Rectal fistula, simple, persistent
- K60.413Rectal fistula, simple, recurrent
- K60.419Rectal fistula, simple, unspecified
- K60.42Rectal fistula, complex
- K60.421Rectal fistula, complex, initial
- K60.422Rectal fistula, complex, persistent
- K60.423Rectal fistula, complex, recurrent
- K60.429Rectal fistula, complex, unspecified
- K60.5Anorectal fistula
- K60.50Anorectal fistula, unspecified
- K60.51Anorectal fistula, simple
- K60.511Anorectal fistula, simple, initial
- K60.512Anorectal fistula, simple, persistent
- K60.513Anorectal fistula, simple, recurrent
- K60.519Anorectal fistula, simple, unspecified
- K60.52Anorectal fistula, complex
- K60.521Anorectal fistula, complex, initial
- K60.522Anorectal fistula, complex, persistent
- K60.523Anorectal fistula, complex, recurrent
- K60.529Anorectal fistula, complex, unspecified
- K61Abscess of anal and rectal regions
- K61.0Anal abscess
- K61.1Rectal abscess
- K61.2Anorectal abscess
- K61.3Ischiorectal abscess
- K61.31Horseshoe abscess
- K61.39Other ischiorectal abscess
- K61.4Intrasphincteric abscess
- K61.5Supralevator abscess
- K62Other diseases of anus and rectum
- K62.0Anal polyp
- K62.1Rectal polyp
- K62.2Anal prolapse
- K62.3Rectal prolapse
- K62.4Stenosis of anus and rectum
- K62.5Hemorrhage of anus and rectum
- K62.6Ulcer of anus and rectum
- K62.7Radiation proctitis
- K62.8Other specified diseases of anus and rectum
- K62.81Anal sphincter tear (healed) (nontraumatic) (old)
- K62.82Dysplasia of anus
- K62.89Other specified diseases of anus and rectum
- K62.9Disease of anus and rectum, unspecified
- K63Other diseases of intestine
- K63.0Abscess of intestine
- K63.1Perforation of intestine (nontraumatic)
- K63.2Fistula of intestine
- K63.3Ulcer of intestine
- K63.4Enteroptosis
- K63.5Polyp of colon
- K63.8Other specified diseases of intestine
- K63.81Dieulafoy lesion of intestine
- K63.82Intestinal microbial overgrowth
- K63.821Small intestinal bacterial overgrowth
- K63.8211Small intestinal bacterial overgrowth, hydrogen-subtype
- K63.8212Small intestinal bacterial overgrowth, hydrogen sulfide-subtype
- K63.8219Small intestinal bacterial overgrowth, unspecified
- K63.822Small intestinal fungal overgrowth
- K63.829Intestinal methanogen overgrowth, unspecified
- K63.89Other specified diseases of intestine
- K63.9Disease of intestine, unspecified
- K64Hemorrhoids and perianal venous thrombosis
- K64.0First degree hemorrhoids
- K64.1Second degree hemorrhoids
- K64.2Third degree hemorrhoids
- K64.3Fourth degree hemorrhoids
- K64.4Residual hemorrhoidal skin tags
- K64.5Perianal venous thrombosis
- K64.8Other hemorrhoids
- K64.9Unspecified hemorrhoids
K55-K64 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Digestive Diseases
When you eat, your body breaks food down to a form it can use to build and nourish cells and provide energy. This process is called digestion. Your digestive system is a series of hollow organs joined in a long, twisting tube. It runs from your mouth to your anus and includes your esophagus, stomach, and small and large intestines. Your liver, gallbladder and pancreas are also involved. They produce juices to help digestion.
Read more about digestive diseases on MedlinePlus