All ICD10 Codes
Chapter 21

Z00–Z99: Factors Influencing Health Status and Contact with Health Services

Factors Influencing Health Status and Contact with Health Services diagnostic classification updated for 2026.

All CodesBillable Only
Internal Codes
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  • 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

  • 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

  • Z30—

    Encounter for contraceptive management

  • Z30.0—

    Encounter for general counseling and advice on contraception

  • Z30.01—

    Encounter for initial prescription of contraceptives

  • Z30.011—

    Encounter for initial prescription of contraceptive pills

  • Z30.012—

    Encounter for prescription of emergency contraception

  • Z30.013—

    Encounter for initial prescription of injectable contraceptive

  • Z30.014—

    Encounter for initial prescription of intrauterine contraceptive device

  • Z30.015—

    Encounter for initial prescription of vaginal ring hormonal contraceptive

  • Z30.016—

    Encounter for initial prescription of transdermal patch hormonal contraceptive device

  • Z30.017—

    Encounter for initial prescription of implantable subdermal contraceptive

  • Z30.018—

    Encounter for initial prescription of other contraceptives

  • Z30.019—

    Encounter for initial prescription of contraceptives, unspecified

  • Z30.02—

    Counseling and instruction in natural family planning to avoid pregnancy

  • Z30.09—

    Encounter for other general counseling and advice on contraception

  • Z30.2—

    Encounter for sterilization

  • Z30.4—

    Encounter for surveillance of contraceptives

  • Z30.40—

    Encounter for surveillance of contraceptives, unspecified

  • Z30.41—

    Encounter for surveillance of contraceptive pills

  • Z30.42—

    Encounter for surveillance of injectable contraceptive

  • Z30.43—

    Encounter for surveillance of intrauterine contraceptive device

  • Z30.430—

    Encounter for insertion of intrauterine contraceptive device

  • Z30.431—

    Encounter for routine checking of intrauterine contraceptive device

  • Z30.432—

    Encounter for removal of intrauterine contraceptive device

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