ICD-10-CM diagnosis code
K63.8219 Small intestinal bacterial overgrowth, unspecified
- Billable
- Yes, a complete code (FY2026)
- Category
- K63 Other diseases of intestine
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Other codes in K63
14 complete codes in this category.
- K63.2Fistula of intestine
- K63.3Ulcer of intestine
- K63.4Enteroptosis
- K63.5Polyp of colon
- K63.81Dieulafoy lesion of intestine
- K63.8211Small intestinal bacterial overgrowth, hydrogen-subtype
- K63.8212Small intestinal bacterial overgrowth, hydrogen sulfide-subtype
- K63.8219Small intestinal bacterial overgrowth, unspecified
- K63.822Small intestinal fungal overgrowth
- K63.829Intestinal methanogen overgrowth, unspecified
- K63.89Other specified diseases of intestine
- K63.9Disease of intestine, unspecified
Documentation tips
- Make sure the note supports every element of the title, “Small intestinal bacterial overgrowth, unspecified”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to K63.
The international WHO ICD-10 also has K63, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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