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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  • B08.71|

    Tanapox virus disease

  • B08.72|

    Yaba pox virus disease

  • B08.79|

    Other yatapoxvirus infections

  • B08.8|

    Other specified viral infections characterized by skin and mucous membrane lesions

  • B09|

    Unspecified viral infection characterized by skin and mucous membrane lesions

  • B10.01|

    Human herpesvirus 6 encephalitis

  • B10.09|

    Other human herpesvirus encephalitis

  • B10.81|

    Human herpesvirus 6 infection

  • B10.82|

    Human herpesvirus 7 infection

  • B10.89|

    Other human herpesvirus infection

  • B15.0|

    Hepatitis A with hepatic coma

  • B15.9|

    Hepatitis A without hepatic coma

  • B16.0|

    Acute hepatitis B with delta-agent with hepatic coma

  • B16.1|

    Acute hepatitis B with delta-agent without hepatic coma

  • B16.2|

    Acute hepatitis B without delta-agent with hepatic coma

  • B16.9|

    Acute hepatitis B without delta-agent and without hepatic coma

  • B17.0|

    Acute delta-(super) infection of hepatitis B carrier

  • B17.10|

    Acute hepatitis C without hepatic coma

  • B17.11|

    Acute hepatitis C with hepatic coma

  • B17.2|

    Acute hepatitis E

  • B17.8|

    Other specified acute viral hepatitis

  • B17.9|

    Acute viral hepatitis, unspecified

  • B18.0|

    Chronic viral hepatitis B with delta-agent

  • B18.1|

    Chronic viral hepatitis B without delta-agent

  • B18.2|

    Chronic viral hepatitis C

  • B18.8|

    Other chronic viral hepatitis

  • B18.9|

    Chronic viral hepatitis, unspecified

  • B19.0|

    Unspecified viral hepatitis with hepatic coma

  • B19.10|

    Unspecified viral hepatitis B without hepatic coma

  • B19.11|

    Unspecified viral hepatitis B with hepatic coma

  • B19.20|

    Unspecified viral hepatitis C without hepatic coma

  • B19.21|

    Unspecified viral hepatitis C with hepatic coma

  • B19.9|

    Unspecified viral hepatitis without hepatic coma

  • B20|

    Human immunodeficiency virus [HIV] disease

  • B25.0|

    Cytomegaloviral pneumonitis

  • B25.1|

    Cytomegaloviral hepatitis

  • B25.2|

    Cytomegaloviral pancreatitis

  • B25.8|

    Other cytomegaloviral diseases

  • B25.9|

    Cytomegaloviral disease, unspecified

  • B26.0|

    Mumps orchitis

  • B26.1|

    Mumps meningitis

  • B26.2|

    Mumps encephalitis

  • B26.3|

    Mumps pancreatitis

  • B26.81|

    Mumps hepatitis

  • B26.82|

    Mumps myocarditis

  • B26.83|

    Mumps nephritis

  • B26.84|

    Mumps polyneuropathy

  • B26.85|

    Mumps arthritis

  • B26.89|

    Other mumps complications

  • B26.9|

    Mumps without complication

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