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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  • B00.4—

    Herpesviral encephalitis

  • B00.5—

    Herpesviral ocular disease

  • 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

  • B00.8—

    Other forms of herpesviral infections

  • B00.81—

    Herpesviral hepatitis

  • B00.82—

    Herpes simplex myelitis

  • B00.89—

    Other herpesviral infection

  • B00.9—

    Herpesviral infection, unspecified

  • B01—

    Varicella [chickenpox]

  • B01.0—

    Varicella meningitis

  • B01.1—

    Varicella encephalitis, myelitis and encephalomyelitis

  • B01.11—

    Varicella encephalitis and encephalomyelitis

  • B01.12—

    Varicella myelitis

  • B01.2—

    Varicella pneumonia

  • B01.8—

    Varicella with other complications

  • B01.81—

    Varicella keratitis

  • B01.89—

    Other varicella complications

  • B01.9—

    Varicella without complication

  • B02—

    Zoster [herpes zoster]

  • B02.0—

    Zoster encephalitis

  • B02.1—

    Zoster meningitis

  • B02.2—

    Zoster with other nervous system involvement

  • B02.21—

    Postherpetic geniculate ganglionitis

  • B02.22—

    Postherpetic trigeminal neuralgia

  • B02.23—

    Postherpetic polyneuropathy

  • B02.24—

    Postherpetic myelitis

  • B02.29—

    Other postherpetic nervous system involvement

  • B02.3—

    Zoster ocular disease

  • B02.30—

    Zoster ocular disease, unspecified

  • B02.31—

    Zoster conjunctivitis

  • B02.32—

    Zoster iridocyclitis

  • B02.33—

    Zoster keratitis

  • B02.34—

    Zoster scleritis

  • B02.39—

    Other herpes zoster eye disease

  • B02.7—

    Disseminated zoster

  • B02.8—

    Zoster with other complications

  • B02.9—

    Zoster without complications

  • B03—

    Smallpox

  • B04—

    Monkeypox

  • B05—

    Measles

  • B05.0—

    Measles complicated by encephalitis

  • B05.1—

    Measles complicated by meningitis

  • B05.2—

    Measles complicated by pneumonia

  • B05.3—

    Measles complicated by otitis media

  • B05.4—

    Measles with intestinal complications

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