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K63.821

⚠ Non-billable (Header)

Small intestinal bacterial overgrowth

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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✅ No additional coding notes for K63.821

Child Codes (3)

K63.8211Small intestinal bacterial overgrowth, hydrogen-subtypeK63.8212Small intestinal bacterial overgrowth, hydrogen sulfide-subtypeK63.8219Small intestinal bacterial overgrowth, unspecified

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Code Information

CodeK63.821
BillableNo — Header code
ParentK63.82
CategoryDiseases of the digestive system (K00-K95)
Excludes10 rule(s)
Excludes20 note(s)
Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)