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K59

⚠ Non-billable (Header)

Other functional intestinal disorders

Diseases of the digestive system (K00-K95)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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❌ Excludes1

direct

Cannot be coded with K59

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

⚠️ Excludes2

direct

May be coded together if both conditions coexist

  • • functional disorders of stomach (K31.-)

Child Codes (7)

K59.0ConstipationK59.1Functional diarrheaK59.2Neurogenic bowel, not elsewhere classifiedK59.3Megacolon, not elsewhere classifiedK59.4Anal spasmK59.8Other specified functional intestinal disordersK59.9Functional intestinal disorder, unspecified

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Code Information

CodeK59
BillableNo — Header code
CategoryDiseases of the digestive system (K00-K95)
Excludes13 rule(s)
Excludes21 note(s)
Child codes7

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)