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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  • B74.2|

    Filariasis due to Brugia timori

  • B74.3|

    Loiasis

  • B74.4|

    Mansonelliasis

  • B74.8|

    Other filariases

  • B74.9|

    Filariasis, unspecified

  • B75|

    Trichinellosis

  • B76.0|

    Ancylostomiasis

  • B76.1|

    Necatoriasis

  • B76.8|

    Other hookworm diseases

  • B76.9|

    Hookworm disease, unspecified

  • B77.0|

    Ascariasis with intestinal complications

  • B77.81|

    Ascariasis pneumonia

  • B77.89|

    Ascariasis with other complications

  • B77.9|

    Ascariasis, unspecified

  • B78.0|

    Intestinal strongyloidiasis

  • B78.1|

    Cutaneous strongyloidiasis

  • B78.7|

    Disseminated strongyloidiasis

  • B78.9|

    Strongyloidiasis, unspecified

  • B79|

    Trichuriasis

  • B80|

    Enterobiasis

  • B81.0|

    Anisakiasis

  • B81.1|

    Intestinal capillariasis

  • B81.2|

    Trichostrongyliasis

  • B81.3|

    Intestinal angiostrongyliasis

  • B81.4|

    Mixed intestinal helminthiases

  • B81.8|

    Other specified intestinal helminthiases

  • B82.0|

    Intestinal helminthiasis, unspecified

  • B82.9|

    Intestinal parasitism, unspecified

  • B83.0|

    Visceral larva migrans

  • B83.1|

    Gnathostomiasis

  • B83.2|

    Angiostrongyliasis due to Parastrongylus cantonensis

  • B83.3|

    Syngamiasis

  • B83.4|

    Internal hirudiniasis

  • B83.8|

    Other specified helminthiases

  • B83.9|

    Helminthiasis, unspecified

  • B85.0|

    Pediculosis due to Pediculus humanus capitis

  • B85.1|

    Pediculosis due to Pediculus humanus corporis

  • B85.2|

    Pediculosis, unspecified

  • B85.3|

    Phthiriasis

  • B85.4|

    Mixed pediculosis and phthiriasis

  • B86|

    Scabies

  • B87.0|

    Cutaneous myiasis

  • B87.1|

    Wound myiasis

  • B87.2|

    Ocular myiasis

  • B87.3|

    Nasopharyngeal myiasis

  • B87.4|

    Aural myiasis

  • B87.81|

    Genitourinary myiasis

  • B87.82|

    Intestinal myiasis

  • B87.89|

    Myiasis of other sites

  • B87.9|

    Myiasis, unspecified

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