ICD-10 Chapter I: Certain infectious and parasitic diseases

ICD-10 is an international statistical classification used in health care and related industries.

ICD-10 chapters
Chapter Block Title
I A00–B99 Certain infectious and parasitic diseases
II C00–D48 Neoplasms
III D50–D89 Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
IV E00–E90 Endocrine, nutritional and metabolic diseases
V F00–F99 Mental and behavioural disorders
VI G00–G99 Diseases of the nervous system
VII H00–H59 Diseases of the eye and adnexa
VIII H60–H95 Diseases of the ear and mastoid process
IX I00–I99 Diseases of the circulatory system
X J00–J99 Diseases of the respiratory system
XI K00–K93 Diseases of the digestive system
XII L00–L99 Diseases of the skin and subcutaneous tissue
XIII M00–M99 Diseases of the musculoskeletal system and connective tissue
XIV N00–N99 Diseases of the genitourinary system
XV O00–O99 Pregnancy, childbirth and the puerperium
XVI P00–P96 Certain conditions originating in the perinatal period
XVII Q00–Q99 Congenital malformations, deformations and chromosomal abnormalities
XVIII R00–R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
XIX S00–T98 Injury, poisoning and certain other consequences of external causes
XX V01–Y98 External causes of morbidity and mortality
XXI Z00–Z99 Factors influencing health status and contact with health services
XXII U00–U99 Codes for special purposes

Produced by the World Health Organization, it is used in several countries around the world. Some have gone on to develop their own national enhancements, building off the international classification.

Chapter I of ICD-10 deals with certain infections and parasitic diseases. Infections specific to a body system are found in other chapters, for example cellulitis is found in Chapter XII.

A00–A79 – Bacterial infections, and other intestinal infectious diseases, and STDs

(A00–A09) Intestinal infectious diseases

(A15–A19) Tuberculosis

(A20–A28) Certain zoonotic bacterial diseases

(A30–A49) Other bacterial diseases

(A50–A64) Infections with a predominantly sexual mode of transmission

(A65–A69) Other spirochaetal diseases

(A70–A74) Other diseases caused by chlamydiae

(A75–A79) Rickettsioses

A80–B34 – Viral infections

(A80–A89) Viral infections of the central nervous system

(A90–A99) Arthropod-borne viral fevers and viral haemorrhagic fevers

(B00–B09) Viral infections characterized by skin and mucous membrane lesions

(B15–B19) Viral hepatitis

(B20–B24) Human immunodeficiency virus (HIV) disease

(B25–B34) Other viral diseases

B35–B89 – Infections caused by fungi, protozoans, worms, and infestations

(B35–B49) Mycoses

(B50–B64) Protozoal diseases

(B65–B83) Helminthiases

(B85–B89) Pediculosis, acariasis and other infestations

B90–B99 – Sequelae, and diseases classified elsewhere

(B90–B94) Sequelae of infectious and parasitic diseases

(B95–B97) Bacterial, viral and other infectious agents

(B99) Other infectious diseases

  • (B99) Other and unspecified infectious diseases


  • Certain localized infections - see body system - related chapters
  • Carrier or suspected carrier of infectious diseases (Z22.-)
  • Infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • Infectious and parasitic diseases complicating pregnancy, childbirth, and the puerperium (O98.-)
  • Influenza and other acute respiratory infections (J00-J22)
  • Emergency codes used for infectious diseases (U04-U06)

See also


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