ICD-10-CM diagnosis code
Z20.818 Contact with and (suspected) exposure to other bacterial communicable diseases
- Billable
- Yes, a complete code (FY2026)
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Other codes in Z20
18 complete codes in this category.
- Z20.4Contact with and (suspected) exposure to rubella
- Z20.5Contact with and (suspected) exposure to viral hepatitis
- Z20.6Contact with and (suspected) exposure to human immunodeficiency virus [HIV]
- Z20.7Contact with and (suspected) exposure to pediculosis, acariasis and other infestations
- Z20.810Contact with and (suspected) exposure to anthrax
- Z20.811Contact with and (suspected) exposure to meningococcus
- Z20.818Contact with and (suspected) exposure to other bacterial communicable diseases
- Z20.820Contact with and (suspected) exposure to varicella
- Z20.821Contact with and (suspected) exposure to Zika virus
- Z20.822Contact with and (suspected) exposure to COVID-19
- Z20.828Contact with and (suspected) exposure to other viral communicable diseases
- Z20.89Contact with and (suspected) exposure to other communicable diseases
Documentation tips
- Make sure the note supports every element of the title, “Contact with and (suspected) exposure to other bacterial communicable diseases”: 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 Z20.
The international WHO ICD-10 also has Z20, 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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