ICD-10-CM · Chapter 21 · Z00-Z99
Z20 Contact with and (suspected) exposure to communicable diseases
Excludes 1 (cannot be coded together)
- carrier of infectious disease (Z22.-)
- diagnosed current infectious or parasitic disease -see Alphabetic Index
Excludes 2 (not included here)
- personal history of infectious and parasitic diseases (Z86.1-)
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| Z20..0 | Contact with and (suspected) exposure to intestinal infectious diseases | No |
| Z20..01 | Contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli) | Yes |
| Z20..09 | Contact with and (suspected) exposure to other intestinal infectious diseases | Yes |
| Z20..1 | Contact with and (suspected) exposure to tuberculosis | Yes |
| Z20..2 | Contact with and (suspected) exposure to infections with a predominantly sexual mode of transmission | Yes |
| Z20..3 | Contact with and (suspected) exposure to rabies | Yes |
| Z20..4 | Contact with and (suspected) exposure to rubella | Yes |
| Z20..5 | Contact with and (suspected) exposure to viral hepatitis | Yes |
| Z20..6 | Contact with and (suspected) exposure to human immunodeficiency virus [HIV] | Yes |
| Z20..7 | Contact with and (suspected) exposure to pediculosis, acariasis and other infestations | Yes |
| Z20..8 | Contact with and (suspected) exposure to other communicable diseases | No |
| Z20..81 | Contact with and (suspected) exposure to other bacterial communicable diseases | No |
| Z20..810 | Contact with and (suspected) exposure to anthrax | Yes |
| Z20..811 | Contact with and (suspected) exposure to meningococcus | Yes |
| Z20..818 | Contact with and (suspected) exposure to other bacterial communicable diseases | Yes |
| Z20..82 | Contact with and (suspected) exposure to other viral communicable diseases | No |
| Z20..820 | Contact with and (suspected) exposure to varicella | Yes |
| Z20..821 | Contact with and (suspected) exposure to Zika virus | Yes |
| Z20..822 | Contact with and (suspected) exposure to COVID-19 | Yes |
| Z20..828 | Contact with and (suspected) exposure to other viral communicable diseases | Yes |
| Z20..89 | Contact with and (suspected) exposure to other communicable diseases | Yes |
| Z20..9 | Contact with and (suspected) exposure to unspecified communicable disease | Yes |
Last reviewed: September 2026