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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  • A36.84|

    Diphtheritic tubulo-interstitial nephropathy

  • A36.85|

    Diphtheritic cystitis

  • A36.86|

    Diphtheritic conjunctivitis

  • A36.89|

    Other diphtheritic complications

  • A36.9|

    Diphtheria, unspecified

  • A37|

    Whooping cough

  • A37.0|

    Whooping cough due to Bordetella pertussis

  • A37.00|

    Whooping cough due to Bordetella pertussis without pneumonia

  • A37.01|

    Whooping cough due to Bordetella pertussis with pneumonia

  • A37.1|

    Whooping cough due to Bordetella parapertussis

  • A37.10|

    Whooping cough due to Bordetella parapertussis without pneumonia

  • A37.11|

    Whooping cough due to Bordetella parapertussis with pneumonia

  • A37.8|

    Whooping cough due to other Bordetella species

  • A37.80|

    Whooping cough due to other Bordetella species without pneumonia

  • A37.81|

    Whooping cough due to other Bordetella species with pneumonia

  • A37.9|

    Whooping cough, unspecified species

  • A37.90|

    Whooping cough, unspecified species without pneumonia

  • A37.91|

    Whooping cough, unspecified species with pneumonia

  • A38|

    Scarlet fever

  • A38.0|

    Scarlet fever with otitis media

  • A38.1|

    Scarlet fever with myocarditis

  • A38.8|

    Scarlet fever with other complications

  • A38.9|

    Scarlet fever, uncomplicated

  • A39|

    Meningococcal infection

  • A39.0|

    Meningococcal meningitis

  • A39.1|

    Waterhouse-Friderichsen syndrome

  • A39.2|

    Acute meningococcemia

  • A39.3|

    Chronic meningococcemia

  • A39.4|

    Meningococcemia, unspecified

  • A39.5|

    Meningococcal heart disease

  • A39.50|

    Meningococcal carditis, unspecified

  • A39.51|

    Meningococcal endocarditis

  • A39.52|

    Meningococcal myocarditis

  • A39.53|

    Meningococcal pericarditis

  • A39.8|

    Other meningococcal infections

  • A39.81|

    Meningococcal encephalitis

  • A39.82|

    Meningococcal retrobulbar neuritis

  • A39.83|

    Meningococcal arthritis

  • A39.84|

    Postmeningococcal arthritis

  • A39.89|

    Other meningococcal infections

  • A39.9|

    Meningococcal infection, unspecified

  • A40|

    Streptococcal sepsis

  • A40.0|

    Sepsis due to streptococcus, group A

  • A40.1|

    Sepsis due to streptococcus, group B

  • A40.3|

    Sepsis due to Streptococcus pneumoniae

  • A40.8|

    Other streptococcal sepsis

  • A40.9|

    Streptococcal sepsis, unspecified

  • A41|

    Other sepsis

  • A41.0|

    Sepsis due to Staphylococcus aureus

  • A41.01|

    Sepsis due to Methicillin susceptible Staphylococcus aureus

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