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K59.1

✓ Billable

Functional diarrhea

Diseases of the digestive system (K00-K95)

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❌ Excludes1

direct

Cannot be coded with K59.1

  • • diarrhea NOS (R19.7)
  • • irritable bowel syndrome with diarrhea (K58.0)

❌ Excludes1

inherited from K59

Rules from parent category K59: Other functional intestinal disorders

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

⚠️ Excludes2

inherited from K59

Rules from parent category K59: Other functional intestinal disorders

  • • functional disorders of stomach (K31.-)

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Code Information

CodeK59.1
BillableYes
ParentK59
CategoryDiseases of the digestive system (K00-K95)
Excludes15 rule(s)
Excludes21 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)