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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  • 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

  • K60.30—

    Anal fistula, unspecified

  • K60.31—

    Anal fistula, simple

  • K60.311—

    Anal fistula, simple, initial

  • K60.312—

    Anal fistula, simple, persistent

  • K60.313—

    Anal fistula, simple, recurrent

  • K60.319—

    Anal fistula, simple, unspecified

  • K60.32—

    Anal fistula, complex

  • K60.321—

    Anal fistula, complex, initial

  • K60.322—

    Anal fistula, complex, persistent

  • K60.323—

    Anal fistula, complex, recurrent

  • K60.329—

    Anal fistula, complex, unspecified

  • K60.4—

    Rectal fistula

  • K60.40—

    Rectal fistula, unspecified

  • K60.41—

    Rectal fistula, simple

  • K60.411—

    Rectal fistula, simple, initial

  • K60.412—

    Rectal fistula, simple, persistent

  • K60.413—

    Rectal fistula, simple, recurrent

  • K60.419—

    Rectal fistula, simple, unspecified

  • K60.42—

    Rectal fistula, complex

  • K60.421—

    Rectal fistula, complex, initial

  • K60.422—

    Rectal fistula, complex, persistent

  • K60.423—

    Rectal fistula, complex, recurrent

  • K60.429—

    Rectal fistula, complex, unspecified

  • K60.5—

    Anorectal fistula

  • K60.50—

    Anorectal fistula, unspecified

  • K60.51—

    Anorectal fistula, simple

  • K60.511—

    Anorectal fistula, simple, initial

  • K60.512—

    Anorectal fistula, simple, persistent

  • K60.513—

    Anorectal fistula, simple, recurrent

  • K60.519—

    Anorectal fistula, simple, unspecified

  • K60.52—

    Anorectal fistula, complex

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