Persons with potential health hazards related to communicable diseases (Z20-Z29)
Z20Contact with and (suspected) exposure to communicable diseases
Excludes 1: carrier of infectious disease (Z22.-)
› diagnosed current infectious or parasitic disease -see Alphabetic Index
Excludes 2: personal history of infectious and parasitic diseases (Z86.1-)
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]
Excludes 1: asymptomatic human immunodeficiency virus [HIV]
› HIV infection status (Z21)
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
› Contact with and (suspected) exposure to SARS-CoV-2
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
› HIV positive NOS
Code First: Human immunodeficiency virus [HIV] disease complicating pregnancy, childbirth and the puerperium, if applicable (O98.7-)
Excludes 1: acquired immunodeficiency syndrome (B20)
› contact with human immunodeficiency virus [HIV] (Z20.6)
› exposure to human immunodeficiency virus [HIV] (Z20.6)
› human immunodeficiency virus [HIV] disease (B20)
› inconclusive laboratory evidence of human immunodeficiency virus [HIV] (R75)
Z22Carrier of infectious disease
Includes: colonization status
› suspected carrier
Excludes 2: carrier of viral hepatitis (B18.-)
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
› MSSA colonization
Z22.322Carrier or suspected carrier of Methicillin resistant Staphylococcus aureus
› MRSA colonization
Z22.33Carrier of bacterial disease due to streptococci
Z22.330Carrier of Group B streptococcus
Excludes 1: Carrier of streptococcus group B (GBS) complicating pregnancy, childbirth and the puerperium (O99.82-)
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
› Carrier of E. coli
› Carrier of K. pneumoniae
Z22.350Carrier of carbapenem-resistant Enterobacterales
Z22.358Carrier of other Enterobacterales
› Carrier of carbapenem-sensitive Enterobacterales
› Carrier of ESBL-producing Enterobacterales
› Carrier of extended-spectrum beta-lactamase producing 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
› Latent tuberculosis infection (LTBI)
Excludes 1: nonspecific reaction to cell mediated immunity measurement of gamma interferon antigen response without active tuberculosis (R76.12)
› nonspecific reaction to tuberculin skin test without active tuberculosis (R76.11)
Z22.8Carrier of other infectious diseases
Z22.9Carrier of infectious disease, unspecified
Z23Encounter for immunization
Code First: any routine childhood examination
Code Also: , if applicable, encounter for immunization safety counseling (Z71.85)
procedure codes are required to identify the types of immunizations given
Z28Immunization not carried out and underimmunization status
Includes: vaccination not carried out
Code Also: , if applicable, encounter for immunization safety counseling (Z71.85)
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
› Immunization not carried out because of religious belief
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
Use Additional Code: code, if applicable, to identify:
› immunization not carried out because of contraindication (Z28.0-)
› immunization not carried out because of patient decision for other and unspecified reason (Z28.2-)
› immunization not carried out because of patient decision for reasons of belief or group pressure (Z28.1)
› immunization not carried out for other reason (Z28.8-)
Z28.31Underimmunization for COVID-19 status
These codes should not be used for individuals who are not eligible for the COVID-19 vaccines, as determined by the healthcare provider.
Z28.310Unvaccinated for COVID-19
Z28.311Partially vaccinated for COVID-19
Z28.39Other underimmunization status
› Delinquent immunization status
› Lapsed immunization schedule 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
› Immunization not carried out because of guardian refusal
› Immunization not carried out because of parent refusal
Excludes 1: immunization not carried out because of caregiver refusal because of religious belief (Z28.1)
Z28.83Immunization not carried out due to unavailability of vaccine
› Delay in delivery of vaccine
› Lack of availability of vaccine
› Manufacturer delay of vaccine
Z28.89Immunization not carried out for other reason
Z28.9Immunization not carried out for unspecified reason
Z29Encounter for other prophylactic measures
Excludes 1: desensitization to allergens (Z51.6)
› prophylactic surgery (Z40.-)
Z29.1Encounter for prophylactic immunotherapy
› Encounter for administration of immunoglobulin
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 globin
Z29.3Encounter for prophylactic fluoride administration
Z29.8Encounter for other specified prophylactic measures
Z29.81Encounter for HIV pre-exposure prophylaxis
Code Also: , if applicable, risk factors for HIV, such as:
› contact with and (suspected) exposure to human immunodeficiency virus [HIV] (Z20.6)
› high risk sexual behavior (Z72.5-)
Z29.89Encounter for other specified prophylactic measures
Z29.9Encounter for prophylactic measures, unspecified