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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  • 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

  • A06.81|

    Amebic cystitis

  • A06.82|

    Other amebic genitourinary infections

  • A06.89|

    Other amebic infections

  • A06.9|

    Amebiasis, unspecified

  • 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

  • A08.0|

    Rotaviral enteritis

  • A08.11|

    Acute gastroenteropathy due to Norwalk agent

  • A08.19|

    Acute gastroenteropathy due to other small round viruses

  • A08.2|

    Adenoviral 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

  • A15.0|

    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

  • A15.8|

    Other respiratory tuberculosis

  • A15.9|

    Respiratory tuberculosis unspecified

  • A17.0|

    Tuberculous meningitis

  • A17.1|

    Meningeal tuberculoma

  • A17.81|

    Tuberculoma of brain and spinal cord

  • A17.82|

    Tuberculous meningoencephalitis

  • A17.83|

    Tuberculous neuritis

  • A17.89|

    Other tuberculosis of nervous system

  • A17.9|

    Tuberculosis of nervous system, unspecified

  • A18.01|

    Tuberculosis of spine

  • A18.02|

    Tuberculous arthritis of other joints

  • A18.03|

    Tuberculosis of other bones

  • A18.09|

    Other musculoskeletal tuberculosis

  • A18.10|

    Tuberculosis of genitourinary system, unspecified

  • A18.11|

    Tuberculosis of kidney and ureter

  • A18.12|

    Tuberculosis of bladder

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