ICD-10-CM Section · K55-K64
Other diseases of intestines
206 codes in this section
206
Total Codes
157
Billable
49
Header (Non-Billable)
10
Top-Level Codes
About Section K55-K64
Section K55-K64 (K55-K64) covers other diseases of intestines. It sits within the Diseases of the digestive system chapter (K00-K95). This section contains 206 ICD-10-CM codes, 157 billable diagnoses you can submit on a claim, and 49 non-billable header codes used to organize the hierarchy.
Codes are organized below by 3-character root. Click the root to see all subcodes underneath it, or click any individual code for full coverage data, payer policies, and linked CPT procedures.
Codes in K55-K64
Grouped by 3-character root code. Click any code for full detail.
K55
Vascular disorders of intestine
36 subcodes
| K55.0 | Acute vascular disorders of intestine | Header |
| K55.01 | Acute (reversible) ischemia of small intestine | Header |
| K55.011 | Focal (segmental) acute (reversible) ischemia of small intestine | Billable |
| K55.012 | Diffuse acute (reversible) ischemia of small intestine | Billable |
| K55.019 | Acute (reversible) ischemia of small intestine, extent unspecified | Billable |
| K55.02 | Acute infarction of small intestine | Header |
| K55.021 | Focal (segmental) acute infarction of small intestine | Billable |
| K55.022 | Diffuse acute infarction of small intestine | Billable |
| K55.029 | Acute infarction of small intestine, extent unspecified | Billable |
| K55.03 | Acute (reversible) ischemia of large intestine | Header |
| K55.031 | Focal (segmental) acute (reversible) ischemia of large intestine | Billable |
| K55.032 | Diffuse acute (reversible) ischemia of large intestine | Billable |
| K55.039 | Acute (reversible) ischemia of large intestine, extent unspecified | Billable |
| K55.04 | Acute infarction of large intestine | Header |
| K55.041 | Focal (segmental) acute infarction of large intestine | Billable |
| K55.042 | Diffuse acute infarction of large intestine | Billable |
| K55.049 | Acute infarction of large intestine, extent unspecified | Billable |
| K55.05 | Acute (reversible) ischemia of intestine, part unspecified | Header |
| K55.051 | Focal (segmental) acute (reversible) ischemia of intestine, part unspecified | Billable |
| K55.052 | Diffuse acute (reversible) ischemia of intestine, part unspecified | Billable |
| K55.059 | Acute (reversible) ischemia of intestine, part and extent unspecified | Billable |
| K55.06 | Acute infarction of intestine, part unspecified | Header |
| K55.061 | Focal (segmental) acute infarction of intestine, part unspecified | Billable |
| K55.062 | Diffuse acute infarction of intestine, part unspecified | Billable |
| K55.069 | Acute infarction of intestine, part and extent unspecified | Billable |
| K55.1 | Chronic vascular disorders of intestine | Billable |
| K55.2 | Angiodysplasia of colon | Header |
| K55.20 | Angiodysplasia of colon without hemorrhage | Billable |
| K55.21 | Angiodysplasia of colon with hemorrhage | Billable |
| K55.3 | Necrotizing enterocolitis | Header |
| K55.30 | Necrotizing enterocolitis, unspecified | Billable |
| K55.31 | Stage 1 necrotizing enterocolitis | Billable |
| K55.32 | Stage 2 necrotizing enterocolitis | Billable |
| K55.33 | Stage 3 necrotizing enterocolitis | Billable |
| K55.8 | Other vascular disorders of intestine | Billable |
| K55.9 | Vascular disorder of intestine, unspecified | Billable |
K56
Paralytic ileus and intestinal obstruction without hernia
21 subcodes
| K56.0 | Paralytic ileus | Billable |
| K56.1 | Intussusception | Billable |
| K56.2 | Volvulus | Billable |
| K56.3 | Gallstone ileus | Billable |
| K56.4 | Other impaction of intestine | Header |
| K56.41 | Fecal impaction | Billable |
| K56.49 | Other impaction of intestine | Billable |
| K56.5 | Intestinal adhesions [bands] with obstruction (postinfection) | Header |
| K56.50 | Intestinal adhesions [bands], unspecified as to partial versus complete obstruction | Billable |
| K56.51 | Intestinal adhesions [bands], with partial obstruction | Billable |
| K56.52 | Intestinal adhesions [bands] with complete obstruction | Billable |
| K56.6 | Other and unspecified intestinal obstruction | Header |
| K56.60 | Unspecified intestinal obstruction | Header |
| K56.600 | Partial intestinal obstruction, unspecified as to cause | Billable |
| K56.601 | Complete intestinal obstruction, unspecified as to cause | Billable |
| K56.609 | Unspecified intestinal obstruction, unspecified as to partial versus complete obstruction | Billable |
| K56.69 | Other intestinal obstruction | Header |
| K56.690 | Other partial intestinal obstruction | Billable |
| K56.691 | Other complete intestinal obstruction | Billable |
| K56.699 | Other intestinal obstruction unspecified as to partial versus complete obstruction | Billable |
| K56.7 | Ileus, unspecified | Billable |
K57
Diverticular disease of intestine
32 subcodes
| K57.0 | Diverticulitis of small intestine with perforation and abscess | Header |
| K57.00 | Diverticulitis of small intestine with perforation and abscess without bleeding | Billable |
| K57.01 | Diverticulitis of small intestine with perforation and abscess with bleeding | Billable |
| K57.1 | Diverticular disease of small intestine without perforation or abscess | Header |
| K57.10 | Diverticulosis of small intestine without perforation or abscess without bleeding | Billable |
| K57.11 | Diverticulosis of small intestine without perforation or abscess with bleeding | Billable |
| K57.12 | Diverticulitis of small intestine without perforation or abscess without bleeding | Billable |
| K57.13 | Diverticulitis of small intestine without perforation or abscess with bleeding | Billable |
| K57.2 | Diverticulitis of large intestine with perforation and abscess | Header |
| K57.20 | Diverticulitis of large intestine with perforation and abscess without bleeding | Billable |
| K57.21 | Diverticulitis of large intestine with perforation and abscess with bleeding | Billable |
| K57.3 | Diverticular disease of large intestine without perforation or abscess | Header |
| K57.30 | Diverticulosis of large intestine without perforation or abscess without bleeding | Billable |
| K57.31 | Diverticulosis of large intestine without perforation or abscess with bleeding | Billable |
| K57.32 | Diverticulitis of large intestine without perforation or abscess without bleeding | Billable |
| K57.33 | Diverticulitis of large intestine without perforation or abscess with bleeding | Billable |
| K57.4 | Diverticulitis of both small and large intestine with perforation and abscess | Header |
| K57.40 | Diverticulitis of both small and large intestine with perforation and abscess without bleeding | Billable |
| K57.41 | Diverticulitis of both small and large intestine with perforation and abscess with bleeding | Billable |
| K57.5 | Diverticular disease of both small and large intestine without perforation or abscess | Header |
| K57.50 | Diverticulosis of both small and large intestine without perforation or abscess without bleeding | Billable |
| K57.51 | Diverticulosis of both small and large intestine without perforation or abscess with bleeding | Billable |
| K57.52 | Diverticulitis of both small and large intestine without perforation or abscess without bleeding | Billable |
| K57.53 | Diverticulitis of both small and large intestine without perforation or abscess with bleeding | Billable |
| K57.8 | Diverticulitis of intestine, part unspecified, with perforation and abscess | Header |
| K57.80 | Diverticulitis of intestine, part unspecified, with perforation and abscess without bleeding | Billable |
| K57.81 | Diverticulitis of intestine, part unspecified, with perforation and abscess with bleeding | Billable |
| K57.9 | Diverticular disease of intestine, part unspecified, without perforation or abscess | Header |
| K57.90 | Diverticulosis of intestine, part unspecified, without perforation or abscess without bleeding | Billable |
| K57.91 | Diverticulosis of intestine, part unspecified, without perforation or abscess with bleeding | Billable |
| K57.92 | Diverticulitis of intestine, part unspecified, without perforation or abscess without bleeding | Billable |
| K57.93 | Diverticulitis of intestine, part unspecified, without perforation or abscess with bleeding | Billable |
K58
Irritable bowel syndrome
5 subcodes
| K58.0 | Irritable bowel syndrome with diarrhea | Billable |
| K58.1 | Irritable bowel syndrome with constipation | Billable |
| K58.2 | Mixed irritable bowel syndrome | Billable |
| K58.8 | Other irritable bowel syndrome | Billable |
| K58.9 | Irritable bowel syndrome, unspecified | Billable |
K59
Other functional intestinal disorders
17 subcodes
| K59.0 | Constipation | Header |
| K59.00 | Constipation, unspecified | Billable |
| K59.01 | Slow transit constipation | Billable |
| K59.02 | Outlet dysfunction constipation | Billable |
| K59.03 | Drug induced constipation | Billable |
| K59.04 | Chronic idiopathic constipation | Billable |
| K59.09 | Other constipation | Billable |
| K59.1 | Functional diarrhea | Billable |
| K59.2 | Neurogenic bowel, not elsewhere classified | Billable |
| K59.3 | Megacolon, not elsewhere classified | Header |
| K59.31 | Toxic megacolon | Billable |
| K59.39 | Other megacolon | Billable |
| K59.4 | Anal spasm | Billable |
| K59.8 | Other specified functional intestinal disorders | Header |
| K59.81 | Ogilvie syndrome | Billable |
| K59.89 | Other specified functional intestinal disorders | Billable |
| K59.9 | Functional intestinal disorder, unspecified | Billable |
K60
Fissure and fistula of anal and rectal regions
39 subcodes
| K60.0 | Acute anal fissure | Billable |
| K60.1 | Chronic anal fissure | Billable |
| K60.2 | Anal fissure, unspecified | Billable |
| K60.3 | Anal fistula | Header |
| K60.30 | Anal fistula, unspecified | Billable |
| K60.31 | Anal fistula, simple | Header |
| K60.311 | Anal fistula, simple, initial | Billable |
| K60.312 | Anal fistula, simple, persistent | Billable |
| K60.313 | Anal fistula, simple, recurrent | Billable |
| K60.319 | Anal fistula, simple, unspecified | Billable |
| K60.32 | Anal fistula, complex | Header |
| K60.321 | Anal fistula, complex, initial | Billable |
| K60.322 | Anal fistula, complex, persistent | Billable |
| K60.323 | Anal fistula, complex, recurrent | Billable |
| K60.329 | Anal fistula, complex, unspecified | Billable |
| K60.4 | Rectal fistula | Header |
| K60.40 | Rectal fistula, unspecified | Billable |
| K60.41 | Rectal fistula, simple | Header |
| K60.411 | Rectal fistula, simple, initial | Billable |
| K60.412 | Rectal fistula, simple, persistent | Billable |
| K60.413 | Rectal fistula, simple, recurrent | Billable |
| K60.419 | Rectal fistula, simple, unspecified | Billable |
| K60.42 | Rectal fistula, complex | Header |
| K60.421 | Rectal fistula, complex, initial | Billable |
| K60.422 | Rectal fistula, complex, persistent | Billable |
| K60.423 | Rectal fistula, complex, recurrent | Billable |
| K60.429 | Rectal fistula, complex, unspecified | Billable |
| K60.5 | Anorectal fistula | Header |
| K60.50 | Anorectal fistula, unspecified | Billable |
| K60.51 | Anorectal fistula, simple | Header |
| K60.511 | Anorectal fistula, simple, initial | Billable |
| K60.512 | Anorectal fistula, simple, persistent | Billable |
| K60.513 | Anorectal fistula, simple, recurrent | Billable |
| K60.519 | Anorectal fistula, simple, unspecified | Billable |
| K60.52 | Anorectal fistula, complex | Header |
| K60.521 | Anorectal fistula, complex, initial | Billable |
| K60.522 | Anorectal fistula, complex, persistent | Billable |
| K60.523 | Anorectal fistula, complex, recurrent | Billable |
| K60.529 | Anorectal fistula, complex, unspecified | Billable |
K61
Abscess of anal and rectal regions
8 subcodes
| K61.0 | Anal abscess | Billable |
| K61.1 | Rectal abscess | Billable |
| K61.2 | Anorectal abscess | Billable |
| K61.3 | Ischiorectal abscess | Header |
| K61.31 | Horseshoe abscess | Billable |
| K61.39 | Other ischiorectal abscess | Billable |
| K61.4 | Intrasphincteric abscess | Billable |
| K61.5 | Supralevator abscess | Billable |
K62
Other diseases of anus and rectum
13 subcodes
| K62.0 | Anal polyp | Billable |
| K62.1 | Rectal polyp | Billable |
| K62.2 | Anal prolapse | Billable |
| K62.3 | Rectal prolapse | Billable |
| K62.4 | Stenosis of anus and rectum | Billable |
| K62.5 | Hemorrhage of anus and rectum | Billable |
| K62.6 | Ulcer of anus and rectum | Billable |
| K62.7 | Radiation proctitis | Billable |
| K62.8 | Other specified diseases of anus and rectum | Header |
| K62.81 | Anal sphincter tear (healed) (nontraumatic) (old) | Billable |
| K62.82 | Dysplasia of anus | Billable |
| K62.89 | Other specified diseases of anus and rectum | Billable |
| K62.9 | Disease of anus and rectum, unspecified | Billable |
K63
Other diseases of intestine
17 subcodes
| K63.0 | Abscess of intestine | Billable |
| K63.1 | Perforation of intestine (nontraumatic) | Billable |
| K63.2 | Fistula of intestine | Billable |
| K63.3 | Ulcer of intestine | Billable |
| K63.4 | Enteroptosis | Billable |
| K63.5 | Polyp of colon | Billable |
| K63.8 | Other specified diseases of intestine | Header |
| K63.81 | Dieulafoy lesion of intestine | Billable |
| K63.82 | Intestinal microbial overgrowth | Header |
| K63.821 | Small intestinal bacterial overgrowth | Header |
| K63.8211 | Small intestinal bacterial overgrowth, hydrogen-subtype | Billable |
| K63.8212 | Small intestinal bacterial overgrowth, hydrogen sulfide-subtype | Billable |
| K63.8219 | Small intestinal bacterial overgrowth, unspecified | Billable |
| K63.822 | Small intestinal fungal overgrowth | Billable |
| K63.829 | Intestinal methanogen overgrowth, unspecified | Billable |
| K63.89 | Other specified diseases of intestine | Billable |
| K63.9 | Disease of intestine, unspecified | Billable |
K64
Hemorrhoids and perianal venous thrombosis
8 subcodes
| K64.0 | First degree hemorrhoids | Billable |
| K64.1 | Second degree hemorrhoids | Billable |
| K64.2 | Third degree hemorrhoids | Billable |
| K64.3 | Fourth degree hemorrhoids | Billable |
| K64.4 | Residual hemorrhoidal skin tags | Billable |
| K64.5 | Perianal venous thrombosis | Billable |
| K64.8 | Other hemorrhoids | Billable |
| K64.9 | Unspecified hemorrhoids | Billable |
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Verified against the CMS 2026 code set on May 31, 2026.
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