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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  • A19.0—

    Acute miliary tuberculosis of a single specified site

  • A19.1—

    Acute miliary tuberculosis of multiple sites

  • A19.2—

    Acute miliary tuberculosis, unspecified

  • A19.8—

    Other miliary tuberculosis

  • A19.9—

    Miliary tuberculosis, unspecified

  • A20—

    Plague

  • A20.0—

    Bubonic plague

  • A20.1—

    Cellulocutaneous plague

  • A20.2—

    Pneumonic plague

  • A20.3—

    Plague meningitis

  • A20.7—

    Septicemic plague

  • A20.8—

    Other forms of plague

  • A20.9—

    Plague, unspecified

  • A21—

    Tularemia

  • A21.0—

    Ulceroglandular tularemia

  • A21.1—

    Oculoglandular tularemia

  • A21.2—

    Pulmonary tularemia

  • A21.3—

    Gastrointestinal tularemia

  • A21.7—

    Generalized tularemia

  • A21.8—

    Other forms of tularemia

  • A21.9—

    Tularemia, unspecified

  • A22—

    Anthrax

  • A22.0—

    Cutaneous anthrax

  • A22.1—

    Pulmonary anthrax

  • A22.2—

    Gastrointestinal anthrax

  • A22.7—

    Anthrax sepsis

  • A22.8—

    Other forms of anthrax

  • A22.9—

    Anthrax, unspecified

  • A23—

    Brucellosis

  • A23.0—

    Brucellosis due to Brucella melitensis

  • A23.1—

    Brucellosis due to Brucella abortus

  • A23.2—

    Brucellosis due to Brucella suis

  • A23.3—

    Brucellosis due to Brucella canis

  • A23.8—

    Other brucellosis

  • A23.9—

    Brucellosis, unspecified

  • A24—

    Glanders and melioidosis

  • A24.0—

    Glanders

  • A24.1—

    Acute and fulminating melioidosis

  • A24.2—

    Subacute and chronic melioidosis

  • A24.3—

    Other melioidosis

  • A24.9—

    Melioidosis, unspecified

  • A25—

    Rat-bite fevers

  • A25.0—

    Spirillosis

  • A25.1—

    Streptobacillosis

  • A25.9—

    Rat-bite fever, unspecified

  • A26—

    Erysipeloid

  • A26.0—

    Cutaneous erysipeloid

  • A26.7—

    Erysipelothrix sepsis

  • A26.8—

    Other forms of erysipeloid

  • A26.9—

    Erysipeloid, unspecified

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