All ICD10 Codes
Chapter 11

K00–K95: Diseases of the Digestive System

Diseases of the Digestive System diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
All CodesBillable Only
Internal Codes
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  • K60.521—

    Anorectal fistula, complex, initial

  • K60.522—

    Anorectal fistula, complex, persistent

  • K60.523—

    Anorectal fistula, complex, recurrent

  • K60.529—

    Anorectal fistula, complex, unspecified

  • 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

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