Z20
ICD-10Non-billable categoryContact w and (suspected) exposure to communicable diseases
Official ICD-10-CM descriptor (FY2026)
Contact with and (suspected) exposure to communicable diseases
Z20 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- carrier of infectious disease (Z22.-)
- diagnosed current infectious or parasitic disease -see Alphabetic Index
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- personal history of infectious and parasitic diseases (Z86.1-)
More specific codes under Z20
- Z20.0Contact w and exposure to intestinal infectious diseasescategory
- Z20.1Contact with and (suspected) exposure to tuberculosis
- Z20.2Contact w and exposure to infect w a sexl mode of transmiss
- Z20.3Contact with and (suspected) exposure to rabies
- Z20.4Contact with and (suspected) exposure to rubella
- Z20.5Contact with and (suspected) exposure to viral hepatitis
- Z20.6Contact w and (suspected) exposure to human immunodef virus
- Z20.7Cntct w & expsr to pediculosis, acariasis & oth infestations
- Z20.8Contact w and exposure to oth communicable diseasescategory
- Z20.9Contact w and exposure to unsp communicable disease
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.