1. Z20 Contact with and (suspected) exposure to communicable diseases

    Excludes1

    • carrier of infectious disease (Z22.-)
    • diagnosed current infectious or parasitic disease -see Alphabetic Index

    Excludes2

    • personal history of infectious and parasitic diseases (Z86.1-)
    1. Z20.0 Contact with and (suspected) exposure to intestinal infectious diseases

      1. Z20.01 Contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli)

      2. Z20.09 Contact with and (suspected) exposure to other intestinal infectious diseases

    2. Z20.1 Contact with and (suspected) exposure to tuberculosis

    3. Z20.2 Contact with and (suspected) exposure to infections with a predominantly sexual mode of transmission

    4. Z20.3 Contact with and (suspected) exposure to rabies

    5. Z20.4 Contact with and (suspected) exposure to rubella

    6. Z20.5 Contact with and (suspected) exposure to viral hepatitis

    7. Z20.6 Contact with and (suspected) exposure to human immunodeficiency virus [HIV]

    8. Z20.7 Contact with and (suspected) exposure to pediculosis, acariasis and other infestations

    9. Z20.8 Contact with and (suspected) exposure to other communicable diseases

      1. Z20.81 Contact with and (suspected) exposure to other bacterial communicable diseases

        • Z20.810 Contact with and (suspected) exposure to anthrax
        • Z20.811 Contact with and (suspected) exposure to meningococcus
        • Z20.818 Contact with and (suspected) exposure to other bacterial communicable diseases
      2. Z20.82 Contact with and (suspected) exposure to other viral communicable diseases

        • Z20.820 Contact with and (suspected) exposure to varicella
        • Z20.821 Contact with and (suspected) exposure to Zika virus
        • Z20.822 Contact with and (suspected) exposure to COVID-19

          Inclusion term(s):

          • Contact with and (suspected) exposure to SARS-CoV-2
        • Z20.828 Contact with and (suspected) exposure to other viral communicable diseases
      3. Z20.89 Contact with and (suspected) exposure to other communicable diseases

    10. Z20.9 Contact with and (suspected) exposure to unspecified communicable disease

Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.