Z20-Z29Not billable, use a more specific code below
Persons with potential health hazards related to communicable diseases (Z20-Z29)
chapter 21: Factors Influencing Health Status and Contact with Health Services
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Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers when and how to use Z codes (Z00-Z99) for encounters and supplementary information, including contact, status, history, screening, aftercare, exams, and social determinants of health.
All codes under Z20-Z29
Z20-Z29 can't be used on a claim. Pick a billable code below; grey headings group them.
- Z20Contact with and (suspected) exposure to communicable diseases
- Z20.0Contact with and (suspected) exposure to intestinal infectious diseases
- Z20.01Contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli)
- Z20.09Contact with and (suspected) exposure to other intestinal infectious diseases
- Z20.1Contact with and (suspected) exposure to tuberculosis
- Z20.2Contact with and (suspected) exposure to infections with a predominantly sexual mode of transmission
- 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 with and (suspected) exposure to human immunodeficiency virus [HIV]
- Z20.7Contact with and (suspected) exposure to pediculosis, acariasis and other infestations
- Z20.8Contact with and (suspected) exposure to other communicable diseases
- Z20.81Contact with and (suspected) exposure to other bacterial communicable diseases
- 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
- Z20.82Contact with and (suspected) exposure to other viral 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
- Z20.9Contact with and (suspected) exposure to unspecified communicable disease
- Z21Asymptomatic human immunodeficiency virus [HIV] infection status
- Z22Carrier of infectious disease
- Z22.0Carrier of typhoid
- Z22.1Carrier of other intestinal infectious diseases
- Z22.2Carrier of diphtheria
- Z22.3Carrier of other specified bacterial diseases
- Z22.31Carrier of bacterial disease due to meningococci
- Z22.32Carrier of bacterial disease due to staphylococci
- Z22.321Carrier or suspected carrier of Methicillin susceptible Staphylococcus aureus
- Z22.322Carrier or suspected carrier of Methicillin resistant Staphylococcus aureus
- Z22.33Carrier of bacterial disease due to streptococci
- Z22.330Carrier of Group B streptococcus
- Z22.338Carrier of other streptococcus
- Z22.34Carrier of Acinetobacter baumannii
- Z22.340Carrier of carbapenem-resistant Acinetobacter baumannii
- Z22.341Carrier of carbapenem-sensitive Acinetobacter baumannii
- Z22.349Carrier of Acinetobacter baumannii, unspecified
- Z22.35Carrier of Enterobacterales
- Z22.350Carrier of carbapenem-resistant Enterobacterales
- Z22.358Carrier of other Enterobacterales
- Z22.359Carrier of Enterobacterales, unspecified
- Z22.39Carrier of other specified bacterial diseases
- Z22.4Carrier of infections with a predominantly sexual mode of transmission
- Z22.6Carrier of human T-lymphotropic virus type-1 [HTLV-1] infection
- Z22.7Latent tuberculosis
- Z22.8Carrier of other infectious diseases
- Z22.9Carrier of infectious disease, unspecified
- Z23Encounter for immunization
- Z28Immunization not carried out and underimmunization status
- Z28.0Immunization not carried out because of contraindication
- Z28.01Immunization not carried out because of acute illness of patient
- Z28.02Immunization not carried out because of chronic illness or condition of patient
- Z28.03Immunization not carried out because of immune compromised state of patient
- Z28.04Immunization not carried out because of patient allergy to vaccine or component
- Z28.09Immunization not carried out because of other contraindication
- Z28.1Immunization not carried out because of patient decision for reasons of belief or group pressure
- Z28.2Immunization not carried out because of patient decision for other and unspecified reason
- Z28.20Immunization not carried out because of patient decision for unspecified reason
- Z28.21Immunization not carried out because of patient refusal
- Z28.29Immunization not carried out because of patient decision for other reason
- Z28.3Underimmunization status
- Z28.31Underimmunization for COVID-19 status
- Z28.310Unvaccinated for COVID-19
- Z28.311Partially vaccinated for COVID-19
- Z28.39Other underimmunization status
- Z28.8Immunization not carried out for other reason
- Z28.81Immunization not carried out due to patient having had the disease
- Z28.82Immunization not carried out because of caregiver refusal
- Z28.83Immunization not carried out due to unavailability of vaccine
- Z28.89Immunization not carried out for other reason
- Z28.9Immunization not carried out for unspecified reason
- Z29Encounter for other prophylactic measures
- Z29.1Encounter for prophylactic immunotherapy
- Z29.11Encounter for prophylactic immunotherapy for respiratory syncytial virus (RSV)
- Z29.12Encounter for prophylactic antivenin
- Z29.13Encounter for prophylactic Rho(D) immune globulin
- Z29.14Encounter for prophylactic rabies immune globulin
- Z29.3Encounter for prophylactic fluoride administration
- Z29.8Encounter for other specified prophylactic measures
- Z29.81Encounter for HIV pre-exposure prophylaxis
- Z29.89Encounter for other specified prophylactic measures
- Z29.9Encounter for prophylactic measures, unspecified
Z20-Z29 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Infectious Diseases
Germs, or microbes, are found everywhere - in the air, soil, and water. There are also germs on your skin and in your body. Many of them are harmless, and some can even be helpful. But some of them can make you sick. Infectious diseases are diseases that are caused by germs.
Read more about infectious diseases on MedlinePlus