All ICD10 Codes
Chapter 1

A00–B99: Certain Infectious and Parasitic Diseases

Certain Infectious and Parasitic Diseases diagnostic classification updated for 2026.

Chapter Instructions

Includes
  • diseases generally recognized as communicable or transmissible
Excludes1(Not coded here. Use a different code.)
  • certain localized infections - see body system-related chapters
Excludes2(Not included here. Code separately if applicable.)
  • carrier or suspected carrier of infectious disease (Z22.-)
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)
Use Additional Code
  • code to identify resistance to antimicrobial drugs (Z16.-)
All CodesBillable Only
Internal Codes
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  • A88—

    Other viral infections of central nervous system, not elsewhere classified

  • A88.0—

    Enteroviral exanthematous fever [Boston exanthem]

  • A88.1—

    Epidemic vertigo

  • A88.8—

    Other specified viral infections of central nervous system

  • A89—

    Unspecified viral infection of central nervous system

  • A90—

    Dengue fever [classical dengue]

  • A91—

    Dengue hemorrhagic fever

  • A92—

    Other mosquito-borne viral fevers

  • A92.0—

    Chikungunya virus disease

  • A92.1—

    O'nyong-nyong fever

  • A92.2—

    Venezuelan equine fever

  • A92.3—

    West Nile virus infection

  • A92.30—

    West Nile virus infection, unspecified

  • A92.31—

    West Nile virus infection with encephalitis

  • A92.32—

    West Nile virus infection with other neurologic manifestation

  • A92.39—

    West Nile virus infection with other complications

  • A92.4—

    Rift Valley fever

  • A92.5—

    Zika virus disease

  • A92.8—

    Other specified mosquito-borne viral fevers

  • A92.9—

    Mosquito-borne viral fever, unspecified

  • A93—

    Other arthropod-borne viral fevers, not elsewhere classified

  • A93.0—

    Oropouche virus disease

  • A93.1—

    Sandfly fever

  • A93.2—

    Colorado tick fever

  • A93.8—

    Other specified arthropod-borne viral fevers

  • A94—

    Unspecified arthropod-borne viral fever

  • A95—

    Yellow fever

  • A95.0—

    Sylvatic yellow fever

  • A95.1—

    Urban yellow fever

  • A95.9—

    Yellow fever, unspecified

  • A96—

    Arenaviral hemorrhagic fever

  • A96.0—

    Junin hemorrhagic fever

  • A96.1—

    Machupo hemorrhagic fever

  • A96.2—

    Lassa fever

  • A96.8—

    Other arenaviral hemorrhagic fevers

  • A96.9—

    Arenaviral hemorrhagic fever, unspecified

  • A98—

    Other viral hemorrhagic fevers, not elsewhere classified

  • A98.0—

    Crimean-Congo hemorrhagic fever

  • A98.1—

    Omsk hemorrhagic fever

  • A98.2—

    Kyasanur Forest disease

  • A98.3—

    Marburg virus disease

  • A98.4—

    Ebola virus disease

  • A98.5—

    Hemorrhagic fever with renal syndrome

  • A98.8—

    Other specified viral hemorrhagic fevers

  • A99—

    Unspecified viral hemorrhagic fever

  • B00—

    Herpesviral [herpes simplex] infections

  • B00.0—

    Eczema herpeticum

  • B00.1—

    Herpesviral vesicular dermatitis

  • B00.2—

    Herpesviral gingivostomatitis and pharyngotonsillitis

  • B00.3—

    Herpesviral meningitis

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