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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  • B55.2—

    Mucocutaneous leishmaniasis

  • B55.9—

    Leishmaniasis, unspecified

  • B56—

    African trypanosomiasis

  • B56.0—

    Gambiense trypanosomiasis

  • B56.1—

    Rhodesiense trypanosomiasis

  • B56.9—

    African trypanosomiasis, unspecified

  • B57—

    Chagas' disease

  • B57.0—

    Acute Chagas' disease with heart involvement

  • B57.1—

    Acute Chagas' disease without heart involvement

  • B57.2—

    Chagas' disease (chronic) with heart involvement

  • B57.3—

    Chagas' disease (chronic) with digestive system involvement

  • B57.30—

    Chagas' disease with digestive system involvement, unspecified

  • B57.31—

    Megaesophagus in Chagas' disease

  • B57.32—

    Megacolon in Chagas' disease

  • B57.39—

    Other digestive system involvement in Chagas' disease

  • B57.4—

    Chagas' disease (chronic) with nervous system involvement

  • B57.40—

    Chagas' disease with nervous system involvement, unspecified

  • B57.41—

    Meningitis in Chagas' disease

  • B57.42—

    Meningoencephalitis in Chagas' disease

  • B57.49—

    Other nervous system involvement in Chagas' disease

  • B57.5—

    Chagas' disease (chronic) with other organ involvement

  • B58—

    Toxoplasmosis

  • B58.0—

    Toxoplasma oculopathy

  • B58.00—

    Toxoplasma oculopathy, unspecified

  • B58.01—

    Toxoplasma chorioretinitis

  • B58.09—

    Other toxoplasma oculopathy

  • B58.1—

    Toxoplasma hepatitis

  • B58.2—

    Toxoplasma meningoencephalitis

  • B58.3—

    Pulmonary toxoplasmosis

  • B58.8—

    Toxoplasmosis with other organ involvement

  • B58.81—

    Toxoplasma myocarditis

  • B58.82—

    Toxoplasma myositis

  • B58.83—

    Toxoplasma tubulo-interstitial nephropathy

  • B58.89—

    Toxoplasmosis with other organ involvement

  • B58.9—

    Toxoplasmosis, unspecified

  • B59—

    Pneumocystosis

  • B60—

    Other protozoal diseases, not elsewhere classified

  • B60.0—

    Babesiosis

  • B60.00—

    Babesiosis, unspecified

  • B60.01—

    Babesiosis due to Babesia microti

  • B60.02—

    Babesiosis due to Babesia duncani

  • B60.03—

    Babesiosis due to Babesia divergens

  • B60.09—

    Other babesiosis

  • B60.1—

    Acanthamebiasis

  • B60.10—

    Acanthamebiasis, unspecified

  • B60.11—

    Meningoencephalitis due to Acanthamoeba (culbertsoni)

  • B60.12—

    Conjunctivitis due to Acanthamoeba

  • B60.13—

    Keratoconjunctivitis due to Acanthamoeba

  • B60.19—

    Other acanthamebic disease

  • B60.2—

    Naegleriasis

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