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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  • B88.01|

    Infestation by Demodex mites

  • B88.09|

    Other acariasis

  • B88.1|

    Tungiasis [sandflea infestation]

  • B88.2|

    Other arthropod infestations

  • B88.3|

    External hirudiniasis

  • B88.8|

    Other specified infestations

  • B88.9|

    Infestation, unspecified

  • B89|

    Unspecified parasitic disease

  • B90.0|

    Sequelae of central nervous system tuberculosis

  • B90.1|

    Sequelae of genitourinary tuberculosis

  • B90.2|

    Sequelae of tuberculosis of bones and joints

  • B90.8|

    Sequelae of tuberculosis of other organs

  • B90.9|

    Sequelae of respiratory and unspecified tuberculosis

  • B91|

    Sequelae of poliomyelitis

  • B92|

    Sequelae of leprosy

  • B94.0|

    Sequelae of trachoma

  • B94.1|

    Sequelae of viral encephalitis

  • B94.2|

    Sequelae of viral hepatitis

  • B94.8|

    Sequelae of other specified infectious and parasitic diseases

  • B94.9|

    Sequelae of unspecified infectious and parasitic disease

  • 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

  • B95.61|

    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

  • B96.0|

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

  • B96.1|

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

  • B96.20|

    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

  • B96.81|

    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

  • B97.0|

    Adenovirus 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

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