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  2. ICD-10-CM Codes List
  3. Z00–Z99
  4. Persons with potential health hazards related to communicable diseases (Z20-Z29)

Persons with potential health hazards related to communicable diseases (Z20-Z29)

The ICD-10-CM codes in the Z20-Z29 range are used to document individuals who have been exposed to or are carriers of communicable diseases, as well as those receiving immunizations or prophylactic treatments. These codes help specify contact with infectious agents, carrier status of infections, immunization encounters, underimmunization, and preventative healthcare measures.

Codes from Z20 cover suspected or confirmed exposure to specific infectious diseases like tuberculosis, rabies, HIV, and various bacterial and viral infections including COVID-19 and varicella. For example, exposure to Escherichia coli is coded under Z20.01, while Z20.822 is reserved for suspected or confirmed exposure to SARS-CoV-2. The Z21 code addresses asymptomatic HIV infection. Carrier status codes under Z22 reflect individuals harboring infectious agents such as typhoid (Z22.0), staphylococci (Z22.32), or sexually transmitted infections (Z22.4). Immunization encounter codes start at Z23, indicating when vaccines like influenza or HPV have been administered. Codes in Z28 denote cases where immunizations were not given or are incomplete due to patient choice, medical contraindications, or other reasons, including refusal of COVID-19 vaccines. Finally, Z29 codes are for encounters involving prophylactic therapies like immune globulins or HIV pre-exposure prophylaxis. These codes provide detailed documentation supporting disease prevention and public health tracking.

  • Factors influencing health status and contact with health services (Z00–Z99)

    • Persons with potential health hazards related to communicable diseases (Z20-Z29)

        • Contact with and (suspected) exposure to communicable diseases (Z20)

        • Z20 Contact with and (suspected) exposure to communicable diseases
        • Z20.0 Contact with and (suspected) exposure to intestinal infectious diseases
        • Z20.01 Contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli)
        • Z20.09 Contact with and (suspected) exposure to other intestinal infectious diseases
        • Z20.1 Contact with and (suspected) exposure to tuberculosis
        • Z20.2 Contact with and (suspected) exposure to infections with a predominantly sexual mode of transmission
        • Z20.3 Contact with and (suspected) exposure to rabies
        • Z20.4 Contact with and (suspected) exposure to rubella
        • Z20.5 Contact with and (suspected) exposure to viral hepatitis
        • Z20.6 Contact with and (suspected) exposure to human immunodeficiency virus [HIV]
        • Z20.7 Contact with and (suspected) exposure to pediculosis, acariasis and other infestations
        • Z20.8 Contact with and (suspected) exposure to other communicable diseases
        • 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
        • 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
        • Z20.828 Contact with and (suspected) exposure to other viral communicable diseases
        • Z20.89 Contact with and (suspected) exposure to other communicable diseases
        • Z20.9 Contact with and (suspected) exposure to unspecified communicable disease

        • Carrier of infectious disease (Z22)

        • Z22 Carrier of infectious disease
        • Z22.0 Carrier of typhoid
        • Z22.1 Carrier of other intestinal infectious diseases
        • Z22.2 Carrier of diphtheria
        • Z22.3 Carrier of other specified bacterial diseases
        • Z22.31 Carrier of bacterial disease due to meningococci
        • Z22.32 Carrier of bacterial disease due to staphylococci
        • Z22.321 Carrier or suspected carrier of Methicillin susceptible Staphylococcus aureus
        • Z22.322 Carrier or suspected carrier of Methicillin resistant Staphylococcus aureus
        • Z22.33 Carrier of bacterial disease due to streptococci
        • Z22.330 Carrier of Group B streptococcus
        • Z22.338 Carrier of other streptococcus
        • Z22.34 Carrier of Acinetobacter baumannii
        • Z22.340 Carrier of carbapenem-resistant Acinetobacter baumannii
        • Z22.341 Carrier of carbapenem-sensitive Acinetobacter baumannii
        • Z22.349 Carrier of Acinetobacter baumannii, unspecified
        • Z22.35 Carrier of Enterobacterales
        • Z22.350 Carrier of carbapenem-resistant Enterobacterales
        • Z22.358 Carrier of other Enterobacterales
        • Z22.359 Carrier of Enterobacterales, unspecified
        • Z22.39 Carrier of other specified bacterial diseases
        • Z22.4 Carrier of infections with a predominantly sexual mode of transmission
        • Z22.6 Carrier of human T-lymphotropic virus type-1 [HTLV-1] infection
        • Z22.7 Latent tuberculosis
        • Z22.8 Carrier of other infectious diseases
        • Z22.9 Carrier of infectious disease, unspecified

        • Immunization not carried out and underimmunization status (Z28)

        • Z28 Immunization not carried out and underimmunization status
        • Z28.0 Immunization not carried out because of contraindication
        • Z28.01 Immunization not carried out because of acute illness of patient
        • Z28.02 Immunization not carried out because of chronic illness or condition of patient
        • Z28.03 Immunization not carried out because of immune compromised state of patient
        • Z28.04 Immunization not carried out because of patient allergy to vaccine or component
        • Z28.09 Immunization not carried out because of other contraindication
        • Z28.1 Immunization not carried out because of patient decision for reasons of belief or group pressure
        • Z28.2 Immunization not carried out because of patient decision for other and unspecified reason
        • Z28.20 Immunization not carried out because of patient decision for unspecified reason
        • Z28.21 Immunization not carried out because of patient refusal
        • Z28.29 Immunization not carried out because of patient decision for other reason
        • Z28.3 Underimmunization status
        • Z28.31 Underimmunization for COVID-19 status
        • Z28.310 Unvaccinated for COVID-19
        • Z28.311 Partially vaccinated for COVID-19
        • Z28.39 Other underimmunization status
        • Z28.8 Immunization not carried out for other reason
        • Z28.81 Immunization not carried out due to patient having had the disease
        • Z28.82 Immunization not carried out because of caregiver refusal
        • Z28.83 Immunization not carried out due to unavailability of vaccine
        • Z28.89 Immunization not carried out for other reason
        • Z28.9 Immunization not carried out for unspecified reason

        • Encounter for other prophylactic measures (Z29)

        • Z29 Encounter for other prophylactic measures
        • Z29.1 Encounter for prophylactic immunotherapy
        • Z29.11 Encounter for prophylactic immunotherapy for respiratory syncytial virus (RSV)
        • Z29.12 Encounter for prophylactic antivenin
        • Z29.13 Encounter for prophylactic Rho(D) immune globulin
        • Z29.14 Encounter for prophylactic rabies immune globin
        • Z29.3 Encounter for prophylactic fluoride administration
        • Z29.8 Encounter for other specified prophylactic measures
        • Z29.81 Encounter for HIV pre-exposure prophylaxis
        • Z29.89 Encounter for other specified prophylactic measures
        • Z29.9 Encounter for prophylactic measures, unspecified