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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  • A05—

    Other bacterial foodborne intoxications, not elsewhere classified

  • A05.0—

    Foodborne staphylococcal intoxication

  • A05.1—

    Botulism food poisoning

  • A05.2—

    Foodborne Clostridium perfringens [Clostridium welchii] intoxication

  • A05.3—

    Foodborne Vibrio parahaemolyticus intoxication

  • A05.4—

    Foodborne Bacillus cereus intoxication

  • A05.5—

    Foodborne Vibrio vulnificus intoxication

  • A05.8—

    Other specified bacterial foodborne intoxications

  • A05.9—

    Bacterial foodborne intoxication, unspecified

  • A06—

    Amebiasis

  • A06.0—

    Acute amebic dysentery

  • A06.1—

    Chronic intestinal amebiasis

  • A06.2—

    Amebic nondysenteric colitis

  • A06.3—

    Ameboma of intestine

  • A06.4—

    Amebic liver abscess

  • A06.5—

    Amebic lung abscess

  • A06.6—

    Amebic brain abscess

  • A06.7—

    Cutaneous amebiasis

  • A06.8—

    Amebic infection of other sites

  • A06.81—

    Amebic cystitis

  • A06.82—

    Other amebic genitourinary infections

  • A06.89—

    Other amebic infections

  • A06.9—

    Amebiasis, unspecified

  • A07—

    Other protozoal intestinal diseases

  • A07.0—

    Balantidiasis

  • A07.1—

    Giardiasis [lambliasis]

  • A07.2—

    Cryptosporidiosis

  • A07.3—

    Isosporiasis

  • A07.4—

    Cyclosporiasis

  • A07.8—

    Other specified protozoal intestinal diseases

  • A07.9—

    Protozoal intestinal disease, unspecified

  • A08—

    Viral and other specified intestinal infections

  • A08.0—

    Rotaviral enteritis

  • A08.1—

    Acute gastroenteropathy due to Norwalk agent and other small round viruses

  • A08.11—

    Acute gastroenteropathy due to Norwalk agent

  • A08.19—

    Acute gastroenteropathy due to other small round viruses

  • A08.2—

    Adenoviral enteritis

  • A08.3—

    Other viral enteritis

  • A08.31—

    Calicivirus enteritis

  • A08.32—

    Astrovirus enteritis

  • A08.39—

    Other viral enteritis

  • A08.4—

    Viral intestinal infection, unspecified

  • A08.8—

    Other specified intestinal infections

  • A09—

    Infectious gastroenteritis and colitis, unspecified

  • A15—

    Respiratory tuberculosis

  • A15.0—

    Tuberculosis of lung

  • A15.4—

    Tuberculosis of intrathoracic lymph nodes

  • A15.5—

    Tuberculosis of larynx, trachea and bronchus

  • A15.6—

    Tuberculous pleurisy

  • A15.7—

    Primary respiratory tuberculosis

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