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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  • A92.8—

    Other specified mosquito-borne viral fevers

  • A92.9—

    Mosquito-borne viral fever, unspecified

  • 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

  • A95.0—

    Sylvatic yellow fever

  • A95.1—

    Urban yellow fever

  • A95.9—

    Yellow fever, unspecified

  • 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

  • A98.0—

    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

  • B00.0—

    Eczema herpeticum

  • B00.1—

    Herpesviral vesicular dermatitis

  • B00.2—

    Herpesviral gingivostomatitis and pharyngotonsillitis

  • B00.3—

    Herpesviral meningitis

  • B00.4—

    Herpesviral encephalitis

  • B00.50—

    Herpesviral ocular disease, unspecified

  • B00.51—

    Herpesviral iridocyclitis

  • B00.52—

    Herpesviral keratitis

  • B00.53—

    Herpesviral conjunctivitis

  • B00.59—

    Other herpesviral disease of eye

  • B00.7—

    Disseminated herpesviral disease

  • B00.81—

    Herpesviral hepatitis

  • B00.82—

    Herpes simplex myelitis

  • B00.89—

    Other herpesviral infection

  • B00.9—

    Herpesviral infection, unspecified

  • B01.0—

    Varicella meningitis

  • B01.11—

    Varicella encephalitis and encephalomyelitis

  • B01.12—

    Varicella myelitis

  • B01.2—

    Varicella pneumonia

  • B01.81—

    Varicella keratitis

  • B01.89—

    Other varicella complications

  • B01.9—

    Varicella without complication

  • B02.0—

    Zoster encephalitis

  • B02.1—

    Zoster meningitis

  • B02.21—

    Postherpetic geniculate ganglionitis

  • B02.22—

    Postherpetic trigeminal neuralgia

  • B02.23—

    Postherpetic polyneuropathy

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