Chapter I of ICD-10 is titled “Certain infectious and parasitic diseases”. It spans codes A00–B99, in 21 blocks.
What Chapter I includes
Conditions and terms that are coded here.
- diseases generally recognized as communicable or transmissible
What Chapter I excludes
Conditions that look similar but belong under another code.
- carrier or suspected carrier of infectious disease Z22.-
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium [except obstetrical tetanus] O98.-
- infectious and parasitic diseases specific to the perinatal period [except tetanus neonatorum, whooping cough, congenital syphilis, perinatal gonococcal infection and perinatal human immunodeficiency virus [HIV] disease] P35-P39
- influenza and other acute respiratory infections J00-J22
Coding notes
- Use additional code (U82-U84), if desired, to identify resistance to antimicrobial drugs
Blocks in Chapter I
- A00–A09Intestinal infectious diseases10 categories
- A15–A19Tuberculosis5 categories
- A20–A28Certain zoonotic bacterial diseases9 categories
- A30–A49Other bacterial diseases18 categories
- A50–A64Infections with a predominantly sexual mode of transmission13 categories
- A65–A69Other spirochaetal diseases5 categories
- A70–A74Other diseases caused by chlamydiae3 categories
- A75–A79Rickettsioses4 categories
- A80–A89Viral infections of the central nervous system10 categories
- A92–A99Arthropod-borne viral fevers and viral haemorrhagic fevers8 categories
- B00–B09Viral infections characterized by skin and mucous membrane lesions10 categories
- B15–B19Viral hepatitis5 categories
- B20–B24Human immunodeficiency virus [HIV] disease5 categories
- B25–B34Other viral diseases6 categories
- B35–B49Mycoses15 categories
- B50–B64Protozoal diseases11 categories
- B65–B83Helminthiases19 categories
- B85–B89Pediculosis, acariasis and other infestations5 categories
- B90–B94Sequelae of infectious and parasitic diseases4 categories
- B95–B98Bacterial, viral and other infectious agents4 categories
- B99–B99Other infectious diseases1 categories
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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