K59.3
⚠ Non-billable (Header)Megacolon, not elsewhere classified
Diseases of the digestive system (K00-K95)
⚠️ This is a category header code — not billable. Use a more specific child code below.
Also Known As
Dilatation of colon
📋 Code Instructions
- • Code first: , if applicable (T51-T65) to identify toxic agent
❌ Excludes1
directCannot be coded with K59.3
- • congenital megacolon (aganglionic) (Q43.1)
- • megacolon (due to) (in) Chagas' disease (B57.32)
- • megacolon (due to) (in) Clostridium difficile (A04.7-)
- • megacolon (due to) (in) Hirschsprung's disease (Q43.1)
❌ Excludes1
inherited from K59Rules 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 K59Rules from parent category K59: Other functional intestinal disorders
- • functional disorders of stomach (K31.-)
Child Codes (2)
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CodeK59.3
BillableNo — Header code
ParentK59
CategoryDiseases of the digestive system (K00-K95)
Excludes17 rule(s)
Excludes21 note(s)
Child codes2
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)