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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  • B95—

    Streptococcus, Staphylococcus, and Enterococcus as the cause of diseases classified elsewhere

  • B95.0—

    Streptococcus, group A, as the cause of diseases classified elsewhere

  • B95.1—

    Streptococcus, group B, as the cause of diseases classified elsewhere

  • B95.2—

    Enterococcus as the cause of diseases classified elsewhere

  • B95.3—

    Streptococcus pneumoniae as the cause of diseases classified elsewhere

  • B95.4—

    Other streptococcus as the cause of diseases classified elsewhere

  • B95.5—

    Unspecified streptococcus as the cause of diseases classified elsewhere

  • B95.6—

    Staphylococcus aureus as the cause of diseases classified elsewhere

  • B95.61—

    Methicillin susceptible Staphylococcus aureus infection as the cause of diseases classified elsewhere

  • B95.62—

    Methicillin resistant Staphylococcus aureus infection as the cause of diseases classified elsewhere

  • B95.7—

    Other staphylococcus as the cause of diseases classified elsewhere

  • B95.8—

    Unspecified staphylococcus as the cause of diseases classified elsewhere

  • B96—

    Other bacterial agents as the cause of diseases classified elsewhere

  • B96.0—

    Mycoplasma pneumoniae [M. pneumoniae] as the cause of diseases classified elsewhere

  • B96.1—

    Klebsiella pneumoniae [K. pneumoniae] as the cause of diseases classified elsewhere

  • B96.2—

    Escherichia coli [E. coli ] as the cause of diseases classified elsewhere

  • B96.20—

    Unspecified Escherichia coli [E. coli] as the cause of diseases classified elsewhere

  • B96.21—

    Shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere

  • B96.22—

    Other specified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhere

  • B96.23—

    Unspecified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhere

  • B96.29—

    Other Escherichia coli [E. coli] as the cause of diseases classified elsewhere

  • B96.3—

    Hemophilus influenzae [H. influenzae] as the cause of diseases classified elsewhere

  • B96.4—

    Proteus (mirabilis) (morganii) as the cause of diseases classified elsewhere

  • B96.5—

    Pseudomonas (aeruginosa) (mallei) (pseudomallei) as the cause of diseases classified elsewhere

  • B96.6—

    Bacteroides fragilis [B. fragilis] as the cause of diseases classified elsewhere

  • B96.7—

    Clostridium perfringens [C. perfringens] as the cause of diseases classified elsewhere

  • B96.8—

    Other specified bacterial agents as the cause of diseases classified elsewhere

  • B96.81—

    Helicobacter pylori [H. pylori] as the cause of diseases classified elsewhere

  • B96.82—

    Vibrio vulnificus as the cause of diseases classified elsewhere

  • B96.83—

    Acinetobacter baumannii as the cause of diseases classified elsewhere

  • B96.89—

    Other specified bacterial agents as the cause of diseases classified elsewhere

  • B97—

    Viral agents as the cause of diseases classified elsewhere

  • B97.0—

    Adenovirus as the cause of diseases classified elsewhere

  • B97.1—

    Enterovirus as the cause of diseases classified elsewhere

  • B97.10—

    Unspecified enterovirus as the cause of diseases classified elsewhere

  • B97.11—

    Coxsackievirus as the cause of diseases classified elsewhere

  • B97.12—

    Echovirus as the cause of diseases classified elsewhere

  • B97.19—

    Other enterovirus as the cause of diseases classified elsewhere

  • B97.2—

    Coronavirus as the cause of diseases classified elsewhere

  • B97.21—

    SARS-associated coronavirus as the cause of diseases classified elsewhere

  • B97.29—

    Other coronavirus as the cause of diseases classified elsewhere

  • B97.3—

    Retrovirus as the cause of diseases classified elsewhere

  • B97.30—

    Unspecified retrovirus as the cause of diseases classified elsewhere

  • B97.31—

    Lentivirus as the cause of diseases classified elsewhere

  • B97.32—

    Oncovirus as the cause of diseases classified elsewhere

  • B97.33—

    Human T-cell lymphotrophic virus, type I [HTLV-I] as the cause of diseases classified elsewhere

  • B97.34—

    Human T-cell lymphotrophic virus, type II [HTLV-II] as the cause of diseases classified elsewhere

  • B97.35—

    Human immunodeficiency virus, type 2 [HIV 2] as the cause of diseases classified elsewhere

  • B97.39—

    Other retrovirus as the cause of diseases classified elsewhere

  • B97.4—

    Respiratory syncytial virus as the cause of diseases classified elsewhere

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