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ICD-10 • Chapter I: Certain infectious and parasitic diseases (A00–B99)
Quick guide by blocks. The search below highlights terms and codes throughout the chapter.
Last updated: November 2025
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A00–A09 Intestinal infectious diseases
| Code | Description |
|---|---|
| A00 | Cholera |
| A01 | Typhoid and paratyphoid fevers |
| A02 | Other salmonella infections |
| A03 | Shigellosis |
| A04 | Other bacterial intestinal infections |
| A05 | Other bacterial foodborne intoxications |
| A06 | Amoebiasis |
| A08 | Viral and other specified intestinal infections |
| A09 | Diarrhoea and gastroenteritis of presumed infectious origin |
A15–A19 Tuberculosis
| Code | Description |
|---|---|
| A15 | Respiratory tuberculosis, with bacteriological and histological confirmation |
| A16 | Tuberculosis of respiratory organs, without bacteriological or histological confirmation |
| A17 | Tuberculosis of nervous system |
| A18 | Tuberculosis of other organs |
| A19 | Miliary tuberculosis |
A20–A28 Certain other bacterial zoonoses
| Code | Description |
|---|---|
| A20 | Plague |
| A21 | Tularemia |
| A22 | Anthrax |
| A23 | Brucellosis |
| A24 | Glanders and melioidosis |
| A25 | Rat-bite fevers |
| A26 | Erysipeloid |
| A27 | Leptospirosis |
| A28 | Other bacterial zoonoses, not elsewhere classified |
A30–A49 Other bacterial diseases
| Code | Description |
|---|---|
| A30 | Leprosy [Hansen's disease] |
| A31 | Infection due to other mycobacteria |
| A32 | Listeriosis |
| A33 | Neonatal tetanus |
| A34 | Obstetrical tetanus |
| A35 | Other tetanus |
| A36 | Diphtheria |
| A37 | Whooping cough |
| A38 | Scarlet fever |
| A39 | Meningococcal infection |
| A40 | Streptococcal septicaemia |
| A41 | Other septicaemia |
| A42 | Actinomycosis |
| A43 | Nocardiosis |
| A44 | Bartonellosis |
| A46 | Erysipelas |
| A48 | Other bacterial diseases, not elsewhere classified |
| A49 | Bacterial infection of unspecified site |
A50–A64 Infections with a predominantly sexual mode of transmission
| Code | Description |
|---|---|
| A50 | Congenital syphilis |
| A51 | Early syphilis |
| A52 | Late syphilis |
| A53 | Other and unspecified syphilis |
| A54 | Gonococcal infection |
| A55 | Chlamydial lymphogranuloma (venereum) |
| A56 | Other sexually transmitted chlamydial diseases |
| A57 | Chancroid |
| A58 | Granuloma inguinale |
| A59 | Trichomoniasis |
| A60 | Anogenital herpesviral [herpes simplex] infection |
| A63 | Other predominantly sexually transmitted diseases, not elsewhere classified |
| A64 | Unspecified sexually transmitted disease |
A65–A69 Other spirochaetal diseases
| Code | Description |
|---|---|
| A65 | Nonvenereal syphilis |
| A66 | Yaws |
| A67 | Pinta [carate] |
| A68 | Relapsing fevers |
| A69 | Other spirochaetal infections |
A70–A74 Other diseases due to Chlamydiae
| Code | Description |
|---|---|
| A70 | Chlamydia psittaci infection [Chlamydophila psittaci] |
| A71 | Trachoma |
| A74 | Other chlamydial diseases |
A75–A79 Rickettsioses
| Code | Description |
|---|---|
| A75 | Typhus fever |
| A77 | Spotted fever [rickettsioses] |
| A78 | Q fever |
| A79 | Other rickettsioses |
A80–A89 Viral infections of central nervous system
| Code | Description |
|---|---|
| A80 | Acute poliomyelitis |
| A81 | Atypical virus infections of central nervous system |
| A82 | Rabies |
| A83 | Mosquito-borne viral encephalitis |
| A84 | Tick-borne viral encephalitis |
| A85 | Other viral encephalitis, not elsewhere classified |
| A86 | Unspecified viral encephalitis |
| A87 | Viral meningitis |
| A88 | Other specified viral infections of central nervous system |
| A89 | Unspecified viral infection of central nervous system |
A90–A99 Arthropod-borne viral fevers and viral haemorrhagic fevers
| Code | Description |
|---|---|
| A90 | Dengue fever [classical dengue] |
| A91 | Dengue haemorrhagic fever |
| A92 | Other mosquito-borne viral fevers |
| A93 | Other arthropod-borne viral fevers, not elsewhere classified |
| A94 | Unspecified arthropod-borne viral fever |
| A95 | Yellow fever |
| A96 | Arenaviral haemorrhagic fever |
| A98 | Other viral haemorrhagic fevers, not elsewhere classified |
| A99 | Unspecified viral haemorrhagic fever |
B00–B09 Viral infections characterized by skin and mucous membrane lesions
| Code | Description |
|---|---|
| B00 | Herpesviral [herpes simplex] infections |
| B01 | Varicella [chickenpox] |
| B02 | Herpes zoster [shingles] |
| B03 | Smallpox |
| B04 | Monkeypox |
| B05 | Measles |
| B06 | Rubella [German measles] |
| B07 | Viral warts |
| B08 | Other viral infections characterized by skin and mucous membrane lesions, not elsewhere classified |
| B09 | Unspecified viral infection characterized by skin and mucous membrane lesions |
B15–B19 Viral hepatitis
| Code | Description |
|---|---|
| B15 | Acute hepatitis A |
| B16 | Acute hepatitis B |
| B17 | Other acute viral hepatitis |
| B18 | Chronic viral hepatitis |
| B19 | Unspecified viral hepatitis |
B20–B24 Human immunodeficiency virus [HIV] disease
| Code | Description |
|---|---|
| B20 | Human immunodeficiency virus [HIV] disease resulting in infectious and parasitic diseases |
| B21 | Human immunodeficiency virus [HIV] disease resulting in malignant neoplasms |
| B22 | Human immunodeficiency virus [HIV] disease resulting in other specified diseases |
| B23 | Human immunodeficiency virus [HIV] disease resulting in other conditions |
| B24 | Unspecified human immunodeficiency virus [HIV] disease |
B25–B34 Other viral diseases
| Code | Description |
|---|---|
| B25 | Cytomegaloviral disease |
| B26 | Mumps |
| B27 | Infectious mononucleosis |
| B30 | Viral conjunctivitis |
| B33 | Other viral diseases, not elsewhere classified |
| B34 | Viral infection of unspecified site |
B35–B49 Mycoses
| Code | Description |
|---|---|
| B35 | Dermatophytosis |
| B36 | Other superficial mycoses |
| B37 | Candidiasis |
| B38 | Coccidioidomycosis |
| B39 | Histoplasmosis |
| B40 | Blastomycosis |
| B41 | Paracoccidioidomycosis |
| B42 | Sporotrichosis |
| B43 | Chromomycosis and phaeomycotic abscess |
| B44 | Aspergillosis |
| B45 | Cryptococcosis |
| B46 | Zygomycosis |
| B47 | Mycetoma |
| B48 | Other mycoses, not elsewhere classified |
| B49 | Unspecified mycosis |
B50–B64 Protozoal diseases
| Code | Description |
|---|---|
| B50 | Plasmodium falciparum malaria |
| B51 | Plasmodium vivax malaria |
| B52 | Plasmodium malariae malaria |
| B53 | Other parasitologically confirmed malaria |
| B54 | Unspecified malaria |
| B55 | Leishmaniasis |
| B56 | African trypanosomiasis |
| B57 | Chagas' disease |
| B58 | Toxoplasmosis |
| B59 | Pneumocystosis |
| B60 | Other protozoal diseases, not elsewhere classified |
| B64 | Unspecified protozoal disease |
B65–B83 Helminthiases
| Code | Description |
|---|---|
| B65 | Schistosomiasis [bilharziasis] |
| B66 | Other fluke infections |
| B67 | Echinococcosis |
| B68 | Taeniasis |
| B69 | Cysticercosis |
| B70 | Diphyllobothriasis and sparganosis |
| B71 | Other cestode infections |
| B72 | Ancylostomiasis and necatoriasis |
| B73 | Onchocerciasis |
| B74 | Filariasis |
| B75 | Trichinellosis |
| B76 | Other intestinal helminthiases |
| B77 | Ascariasis |
| B78 | Strongyloidiasis |
| B79 | Trichuriasis |
| B80 | Enterobiasis |
| B81 | Other specified intestinal helminthiases |
| B82 | Unspecified intestinal parasitism |
| B83 | Other helminthiases |
B85–B89 Pediculosis, acariasis and other infestations
| Code | Description |
|---|---|
| B85 | Pediculosis and phthiriasis |
| B86 | Scabies |
| B87 | Myiasis |
| B88 | Other infestations |
| B89 | Parasitic disease, unspecified site |
B90–B94 Sequelae of infectious and parasitic diseases
| Code | Description |
|---|---|
| B90 | Sequelae of tuberculosis |
| B91 | Sequelae of poliomyelitis |
| B92 | Sequelae of leprosy |
| B94 | Sequelae of other and unspecified infectious and parasitic diseases |
B95–B97 Bacterial and viral agents as the cause of diseases classified elsewhere
| Code | Description |
|---|---|
| B95 | Streptococcus and Staphylococcus as the cause of diseases classified elsewhere |
| B96 | Other bacterial agents as the cause of diseases classified elsewhere |
| B97 | Viral agents as the cause of diseases classified elsewhere |
B99 Other infectious diseases
| Code | Description |
|---|---|
| B99 | Other infectious diseases |
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