A00-B99
ICD-10-CM Chapter 1: Certain infectious and parasitic diseases
Chapter 1 of the ICD-10-CM tabular list covers A00-B99. It contains 22 blocks of related categories, listed below with the categories published in each.
Includes
- diseases generally recognized as communicable or transmissible
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- certain localized infections - see body system-related chapters
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- 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
Report an additional code to identify the associated condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
A00-A09: Intestinal infectious diseases
- A00Choleracategory
- A01Typhoid and paratyphoid feverscategory
- A02Other salmonella infectionscategory
- A03Shigellosiscategory
- A04Other bacterial intestinal infectionscategory
- A05Oth bacterial foodborne intoxications, NECcategory
- A06Amebiasiscategory
- A07Other protozoal intestinal diseasescategory
- A08Viral and other specified intestinal infectionscategory
- A09Infectious gastroenteritis and colitis, unspecified
A15-A19: Tuberculosis
A20-A28: Certain zoonotic bacterial diseases
A30-A49: Other bacterial diseases
- A30Leprosy [Hansen's disease]category
- A31Infection due to other mycobacteriacategory
- A32Listeriosiscategory
- A33Tetanus neonatorum
- A34Obstetrical tetanus
- A35Other tetanus
- A36Diphtheriacategory
- A37Whooping coughcategory
- A38Scarlet fevercategory
- A39Meningococcal infectioncategory
- A40Streptococcal sepsiscategory
- A41Other sepsiscategory
- A42Actinomycosiscategory
- A43Nocardiosiscategory
- A44Bartonellosiscategory
- A46Erysipelas
- A48Other bacterial diseases, not elsewhere classifiedcategory
- A49Bacterial infection of unspecified sitecategory
A50-A64: Infections with a predominantly sexual mode of transmission
- A50Congenital syphiliscategory
- A51Early syphiliscategory
- A52Late syphiliscategory
- A53Other and unspecified syphiliscategory
- A54Gonococcal infectioncategory
- A55Chlamydial lymphogranuloma (venereum)
- A56Other sexually transmitted chlamydial diseasescategory
- A57Chancroid
- A58Granuloma inguinale
- A59Trichomoniasiscategory
- A60Anogenital herpesviral [herpes simplex] infectionscategory
- A63Oth predominantly sexually transmitted diseases, NECcategory
- A64Unspecified sexually transmitted disease
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
- A80Acute poliomyelitiscategory
- A81Atypical virus infections of central nervous systemcategory
- A82Rabiescategory
- A83Mosquito-borne viral encephalitiscategory
- A84Tick-borne viral encephalitiscategory
- A85Other viral encephalitis, not elsewhere classifiedcategory
- A86Unspecified viral encephalitis
- A87Viral meningitiscategory
- A88Oth viral infections of central nervous system, NECcategory
- A89Unspecified viral infection of central nervous system
A90-A99: Arthropod-borne viral fevers and viral hemorrhagic fevers
- A90Dengue fever [classical dengue]
- A91Dengue hemorrhagic fever
- A92Other mosquito-borne viral feverscategory
- A93Other arthropod-borne viral fevers, not elsewhere classifiedcategory
- A94Unspecified arthropod-borne viral fever
- A95Yellow fevercategory
- A96Arenaviral hemorrhagic fevercategory
- A98Other viral hemorrhagic fevers, not elsewhere classifiedcategory
- A99Unspecified viral hemorrhagic fever
B00-B09: Viral infections characterized by skin and mucous membrane lesions
- B00Herpesviral [herpes simplex] infectionscategory
- B01Varicella [chickenpox]category
- B02Zoster [herpes zoster]category
- B03Smallpox
- B04Monkeypox
- B05Measlescategory
- B06Rubella [German measles]category
- B07Viral wartscategory
- B08Oth viral infect with skin and mucous membrane lesions, NECcategory
- B09Unsp viral infection with skin and mucous membrane lesions
B10: Other human herpesviruses
B15-B19: Viral hepatitis
B20: Human immunodeficiency virus [HIV] disease
B25-B34: Other viral diseases
B35-B49: Mycoses
- B35Dermatophytosiscategory
- B36Other superficial mycosescategory
- B37Candidiasiscategory
- B38Coccidioidomycosiscategory
- B39Histoplasmosiscategory
- B40Blastomycosiscategory
- B41Paracoccidioidomycosiscategory
- B42Sporotrichosiscategory
- B43Chromomycosis and pheomycotic abscesscategory
- B44Aspergillosiscategory
- B45Cryptococcosiscategory
- B46Zygomycosiscategory
- B47Mycetomacategory
- B48Other mycoses, not elsewhere classifiedcategory
- B49Unspecified mycosis
B50-B64: Protozoal diseases
- B50Plasmodium falciparum malariacategory
- B51Plasmodium vivax malariacategory
- B52Plasmodium malariae malariacategory
- B53Other specified malariacategory
- B54Unspecified malaria
- B55Leishmaniasiscategory
- B56African trypanosomiasiscategory
- B57Chagas' diseasecategory
- B58Toxoplasmosiscategory
- B59Pneumocystosis
- B60Other protozoal diseases, not elsewhere classifiedcategory
- B64Unspecified protozoal disease
B65-B83: Helminthiases
- B65Schistosomiasis [bilharziasis]category
- B66Other fluke infectionscategory
- B67Echinococcosiscategory
- B68Taeniasiscategory
- B69Cysticercosiscategory
- B70Diphyllobothriasis and sparganosiscategory
- B71Other cestode infectionscategory
- B72Dracunculiasis
- B73Onchocerciasiscategory
- B74Filariasiscategory
- B75Trichinellosis
- B76Hookworm diseasescategory
- B77Ascariasiscategory
- B78Strongyloidiasiscategory
- B79Trichuriasis
- B80Enterobiasis
- B81Other intestinal helminthiases, not elsewhere classifiedcategory
- B82Unspecified intestinal parasitismcategory
- B83Other helminthiasescategory
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
Source
ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.