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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  • K60.0—

    Acute anal fissure

  • K60.1—

    Chronic anal fissure

  • K60.2—

    Anal fissure, unspecified

  • K60.30—

    Anal fistula, unspecified

  • K60.311—

    Anal fistula, simple, initial

  • K60.312—

    Anal fistula, simple, persistent

  • K60.313—

    Anal fistula, simple, recurrent

  • K60.319—

    Anal fistula, simple, unspecified

  • K60.321—

    Anal fistula, complex, initial

  • K60.322—

    Anal fistula, complex, persistent

  • K60.323—

    Anal fistula, complex, recurrent

  • K60.329—

    Anal fistula, complex, unspecified

  • K60.40—

    Rectal fistula, unspecified

  • K60.411—

    Rectal fistula, simple, initial

  • K60.412—

    Rectal fistula, simple, persistent

  • K60.413—

    Rectal fistula, simple, recurrent

  • K60.419—

    Rectal fistula, simple, unspecified

  • K60.421—

    Rectal fistula, complex, initial

  • K60.422—

    Rectal fistula, complex, persistent

  • K60.423—

    Rectal fistula, complex, recurrent

  • K60.429—

    Rectal fistula, complex, unspecified

  • K60.50—

    Anorectal fistula, unspecified

  • K60.511—

    Anorectal fistula, simple, initial

  • K60.512—

    Anorectal fistula, simple, persistent

  • K60.513—

    Anorectal fistula, simple, recurrent

  • K60.519—

    Anorectal fistula, simple, unspecified

  • K60.521—

    Anorectal fistula, complex, initial

  • K60.522—

    Anorectal fistula, complex, persistent

  • K60.523—

    Anorectal fistula, complex, recurrent

  • K60.529—

    Anorectal fistula, complex, unspecified

  • K61.0—

    Anal abscess

  • K61.1—

    Rectal abscess

  • K61.2—

    Anorectal abscess

  • K61.31—

    Horseshoe abscess

  • K61.39—

    Other ischiorectal abscess

  • K61.4—

    Intrasphincteric abscess

  • K61.5—

    Supralevator abscess

  • 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

  • K62.81—

    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

  • K63.0—

    Abscess of intestine

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