ICD-10-CM · Chapter 1 · A00-B99
Certain infectious and parasitic diseases
1,068 billable diagnosis codes across 22 code blocks. FY2027 release.
Includes
- diseases generally recognized as communicable or transmissible
Excludes 2 (not included here)
- 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 (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.-)
A00-A09 Intestinal infectious diseases
- A00 Cholera
- A01 Typhoid and paratyphoid fevers
- A02 Other salmonella infections
- A03 Shigellosis
- A04 Other bacterial intestinal infections
- A05 Other bacterial foodborne intoxications, not elsewhere classified
- A06 Amebiasis
- A07 Other protozoal intestinal diseases
- A08 Viral and other specified intestinal infections
- A09 Infectious gastroenteritis and colitis, unspecified Billable
A15-A19 Tuberculosis
A20-A28 Certain zoonotic bacterial diseases
A30-A49 Other bacterial diseases
- A30 Leprosy [Hansen's disease]
- A31 Infection due to other mycobacteria
- A32 Listeriosis
- A33 Tetanus neonatorum Billable
- A34 Obstetrical tetanus Billable
- A35 Other tetanus Billable
- A36 Diphtheria
- A37 Whooping cough
- A38 Scarlet fever
- A39 Meningococcal infection
- A40 Streptococcal sepsis
- A41 Other sepsis
- A42 Actinomycosis
- A43 Nocardiosis
- A44 Bartonellosis
- A46 Erysipelas Billable
- A48 Other bacterial diseases, not elsewhere classified
- A49 Bacterial infection of unspecified site
A50-A64 Infections with a predominantly sexual mode of transmission
- A50 Congenital syphilis
- A51 Early syphilis
- A52 Late syphilis
- A53 Other and unspecified syphilis
- A54 Gonococcal infection
- A55 Chlamydial lymphogranuloma (venereum) Billable
- A56 Other sexually transmitted chlamydial diseases
- A57 Chancroid Billable
- A58 Granuloma inguinale Billable
- A59 Trichomoniasis
- A60 Anogenital herpesviral [herpes simplex] infections
- A63 Other predominantly sexually transmitted diseases, not elsewhere classified
- A64 Unspecified sexually transmitted disease Billable
A65-A69 Other spirochetal diseases
A70-A74 Other diseases caused by chlamydiae
A75-A79 Rickettsioses
A80-A89 Viral and prion infections of the central nervous system
- 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 Billable
- A87 Viral meningitis
- A88 Other viral infections of central nervous system, not elsewhere classified
- A89 Unspecified viral infection of central nervous system Billable
A90-A99 Arthropod-borne viral fevers and viral hemorrhagic fevers
- A90 Dengue fever [classical dengue] Billable
- A91 Dengue hemorrhagic fever Billable
- A92 Other mosquito-borne viral fevers
- A93 Other arthropod-borne viral fevers, not elsewhere classified
- A94 Unspecified arthropod-borne viral fever Billable
- A95 Yellow fever
- A96 Arenaviral hemorrhagic fever
- A98 Other viral hemorrhagic fevers, not elsewhere classified
- A99 Unspecified viral hemorrhagic fever Billable
B00-B09 Viral infections characterized by skin and mucous membrane lesions
- B00 Herpesviral [herpes simplex] infections
- B01 Varicella [chickenpox]
- B02 Zoster [herpes zoster]
- B03 Smallpox Billable
- B04 Monkeypox Billable
- 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 Billable
B10 Other human herpesviruses
B15-B19 Viral hepatitis
B20 Human immunodeficiency virus [HIV] disease
B25-B34 Other viral diseases
B35-B49 Mycoses
- B35 Dermatophytosis
- B36 Other superficial mycoses
- B37 Candidiasis
- B38 Coccidioidomycosis
- B39 Histoplasmosis
- B40 Blastomycosis
- B41 Paracoccidioidomycosis
- B42 Sporotrichosis
- B43 Chromomycosis and pheomycotic abscess
- B44 Aspergillosis
- B45 Cryptococcosis
- B46 Zygomycosis
- B47 Mycetoma
- B48 Other mycoses, not elsewhere classified
- B49 Unspecified mycosis Billable
B50-B64 Protozoal diseases
- B50 Plasmodium falciparum malaria
- B51 Plasmodium vivax malaria
- B52 Plasmodium malariae malaria
- B53 Other specified malaria
- B54 Unspecified malaria Billable
- B55 Leishmaniasis
- B56 African trypanosomiasis
- B57 Chagas' disease
- B58 Toxoplasmosis
- B59 Pneumocystosis Billable
- B60 Other protozoal diseases, not elsewhere classified
- B64 Unspecified protozoal disease Billable
B65-B83 Helminthiases
- B65 Schistosomiasis [bilharziasis]
- B66 Other fluke infections
- B67 Echinococcosis
- B68 Taeniasis
- B69 Cysticercosis
- B70 Diphyllobothriasis and sparganosis
- B71 Other cestode infections
- B72 Dracunculiasis Billable
- B73 Onchocerciasis
- B74 Filariasis
- B75 Trichinellosis Billable
- B76 Hookworm diseases
- B77 Ascariasis
- B78 Strongyloidiasis
- B79 Trichuriasis Billable
- B80 Enterobiasis Billable
- B81 Other intestinal helminthiases, not elsewhere classified
- B82 Unspecified intestinal parasitism
- B83 Other helminthiases
B85-B89 Pediculosis, acariasis and other infestations
B90-B94 Sequelae of infectious and parasitic diseases
B95-B97 Bacterial and viral infectious agents
B99 Other infectious diseases
Last reviewed: September 2026