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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  • B10.01—

    Human herpesvirus 6 encephalitis

  • B10.09—

    Other human herpesvirus encephalitis

  • B10.8—

    Other human herpesvirus infection

  • B10.81—

    Human herpesvirus 6 infection

  • B10.82—

    Human herpesvirus 7 infection

  • B10.89—

    Other human herpesvirus infection

  • B15—

    Acute hepatitis A

  • B15.0—

    Hepatitis A with hepatic coma

  • B15.9—

    Hepatitis A without hepatic coma

  • B16—

    Acute hepatitis B

  • 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—

    Other acute viral hepatitis

  • B17.0—

    Acute delta-(super) infection of hepatitis B carrier

  • B17.1—

    Acute hepatitis C

  • 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—

    Chronic viral hepatitis

  • 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—

    Unspecified viral hepatitis

  • B19.0—

    Unspecified viral hepatitis with hepatic coma

  • B19.1—

    Unspecified viral hepatitis B

  • B19.10—

    Unspecified viral hepatitis B without hepatic coma

  • B19.11—

    Unspecified viral hepatitis B with hepatic coma

  • B19.2—

    Unspecified viral hepatitis C

  • 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—

    Cytomegaloviral disease

  • B25.0—

    Cytomegaloviral pneumonitis

  • B25.1—

    Cytomegaloviral hepatitis

  • B25.2—

    Cytomegaloviral pancreatitis

  • B25.8—

    Other cytomegaloviral diseases

  • B25.9—

    Cytomegaloviral disease, unspecified

  • B26—

    Mumps

  • B26.0—

    Mumps orchitis

  • B26.1—

    Mumps meningitis

  • B26.2—

    Mumps encephalitis

  • B26.3—

    Mumps pancreatitis

  • B26.8—

    Mumps with other complications

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