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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  • A35—

    Other tetanus

  • A36.0—

    Pharyngeal diphtheria

  • A36.1—

    Nasopharyngeal diphtheria

  • A36.2—

    Laryngeal diphtheria

  • A36.3—

    Cutaneous diphtheria

  • A36.81—

    Diphtheritic cardiomyopathy

  • A36.82—

    Diphtheritic radiculomyelitis

  • A36.83—

    Diphtheritic polyneuritis

  • A36.84—

    Diphtheritic tubulo-interstitial nephropathy

  • A36.85—

    Diphtheritic cystitis

  • A36.86—

    Diphtheritic conjunctivitis

  • A36.89—

    Other diphtheritic complications

  • A36.9—

    Diphtheria, unspecified

  • A37.00—

    Whooping cough due to Bordetella pertussis without pneumonia

  • A37.01—

    Whooping cough due to Bordetella pertussis with pneumonia

  • A37.10—

    Whooping cough due to Bordetella parapertussis without pneumonia

  • A37.11—

    Whooping cough due to Bordetella parapertussis with pneumonia

  • A37.80—

    Whooping cough due to other Bordetella species without pneumonia

  • A37.81—

    Whooping cough due to other Bordetella species with pneumonia

  • A37.90—

    Whooping cough, unspecified species without pneumonia

  • A37.91—

    Whooping cough, unspecified species with pneumonia

  • 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

  • A39.0—

    Meningococcal meningitis

  • A39.1—

    Waterhouse-Friderichsen syndrome

  • A39.2—

    Acute meningococcemia

  • A39.3—

    Chronic meningococcemia

  • A39.4—

    Meningococcemia, unspecified

  • A39.50—

    Meningococcal carditis, unspecified

  • A39.51—

    Meningococcal endocarditis

  • A39.52—

    Meningococcal myocarditis

  • A39.53—

    Meningococcal pericarditis

  • 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

  • A40.0—

    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

  • A41.01—

    Sepsis due to Methicillin susceptible Staphylococcus aureus

  • A41.02—

    Sepsis due to Methicillin resistant Staphylococcus aureus

  • A41.1—

    Sepsis due to other specified staphylococcus

  • A41.2—

    Sepsis due to unspecified staphylococcus

  • A41.3—

    Sepsis due to Hemophilus influenzae

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