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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  • B97.5—

    Reovirus as the cause of diseases classified elsewhere

  • B97.6—

    Parvovirus as the cause of diseases classified elsewhere

  • B97.7—

    Papillomavirus as the cause of diseases classified elsewhere

  • B97.8—

    Other viral agents as the cause of diseases classified elsewhere

  • B97.81—

    Human metapneumovirus as the cause of diseases classified elsewhere

  • B97.89—

    Other viral agents as the cause of diseases classified elsewhere

  • B99—

    Other and unspecified infectious diseases

  • B99.8—

    Other infectious disease

  • B99.9—

    Unspecified infectious disease

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