U.S. ICD-10-CM reference · FY2027
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K59Category · further specificity requiredCurrent

Other functional intestinal disorders

HierarchyK55-K64 · K59

Code-level instructions

Excludes 1
  • change in bowel habit NOS (R19.4)
  • intestinal malabsorption (K90.-)
  • psychogenic intestinal disorders (F45.8)
Excludes 2

functional disorders of stomach (K31.-)

Inherited instructions

Chapters 11 · Diseases of the digestive system (K00-K95)

Excludes 2
  • 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)

More specific codes

K59.0ConstipationCategory · further specificity requiredK59.1Functional diarrheaBillable / specificK59.2Neurogenic bowel, not elsewhere classifiedBillable / specificK59.3Megacolon, not elsewhere classifiedCategory · further specificity requiredK59.4Anal spasmBillable / specificK59.8Other specified functional intestinal disordersCategory · further specificity requiredK59.9Functional intestinal disorder, unspecifiedBillable / specific
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