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A00-B99 - Certain infectious and parasitic diseases

ICD-10-CM Chapter 1 · 22 sections · 167 categories · 1,309 codes · FY2027

Covers bacterial, viral, and parasitic infections including tuberculosis, HIV, hepatitis, and other communicable diseases.

Chapter Notes

IncludesFrom Chapter A00-B99

Conditions this code covers.

  • diseases generally recognized as communicable or transmissible
Excludes 2 — Not Included HereFrom Chapter A00-B99

Not part of this code; report both codes when the patient has both conditions.

  • 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 CodeFrom Chapter A00-B99

Add a secondary code to identify the associated condition or cause when it is documented.

  • code to identify resistance to antimicrobial drugs (Z16.-)

Categories in this Chapter (167)

A00-A09Intestinal infectious diseases (A00-A09)(10)

A00Cholera3 codes→
A01Typhoid and paratyphoid fevers12 codes→
A02Other salmonella infections12 codes→
A03Shigellosis6 codes→
A04Other bacterial intestinal infections12 codes→
A05Other bacterial foodborne intoxications, not elsewhere classified8 codes→
A06Amebiasis13 codes→
A07Other protozoal intestinal diseases7 codes→
A08Viral and other specified intestinal infections11 codes→
A09Infectious gastroenteritis and colitis, unspecified→

A15-A19Tuberculosis (A15-A19)(4)

A15Respiratory tuberculosis7 codes→
A17Tuberculosis of nervous system8 codes→
A18Tuberculosis of other organs37 codes→
A19Miliary tuberculosis5 codes→

A20-A28Certain zoonotic bacterial diseases (A20-A28)(9)

A20Plague7 codes→
A21Tularemia7 codes→
A22Anthrax6 codes→
A23Brucellosis6 codes→
A24Glanders and melioidosis5 codes→
A25Rat-bite fevers3 codes→
A26Erysipeloid4 codes→
A27Leptospirosis5 codes→
A28Other zoonotic bacterial diseases, not elsewhere classified5 codes→

A30-A49Other bacterial diseases (A30-A49)(18)

A30Leprosy [Hansen's disease]8 codes→
A31Infection due to other mycobacteria5 codes→
A32Listeriosis10 codes→
A33Tetanus neonatorum→
A34Obstetrical tetanus→
A35Other tetanus→
A36Diphtheria13 codes→
A37Whooping cough12 codes→
A38Scarlet fever4 codes→
A39Meningococcal infection17 codes→
A40Streptococcal sepsis5 codes→
A41Other sepsis18 codes→
A42Actinomycosis9 codes→
A43Nocardiosis4 codes→
A44Bartonellosis4 codes→
A46Erysipelas→
A48Other bacterial diseases, not elsewhere classified9 codes→
A49Bacterial infection of unspecified site8 codes→

A50-A64Infections with a predominantly sexual mode of transmission (A50-A64)(13)

A50Congenital syphilis37 codes→
A51Early syphilis17 codes→
A52Late syphilis33 codes→
A53Other and unspecified syphilis2 codes→
A54Gonococcal infection36 codes→
A55Chlamydial lymphogranuloma (venereum)→
A56Other sexually transmitted chlamydial diseases12 codes→
A57Chancroid→
A58Granuloma inguinale→
A59Trichomoniasis8 codes→
A60Anogenital herpesviral [herpes simplex] infections9 codes→
A63Other predominantly sexually transmitted diseases, not elsewhere classified2 codes→
A64Unspecified sexually transmitted disease→

A65-A69Other spirochetal diseases (A65-A69)(5)

A65Nonvenereal syphilis→
A66Yaws10 codes→
A67Pinta [carate]5 codes→
A68Relapsing fevers3 codes→
A69Other spirochetal infections10 codes→

A70-A74Other diseases caused by chlamydiae (A70-A74)(3)

A70Chlamydia psittaci infections→
A71Trachoma3 codes→
A74Other diseases caused by chlamydiae5 codes→

A75-A79Rickettsioses (A75-A79)(4)

A75Typhus fever5 codes→
A77Spotted fever [tick-borne rickettsioses]10 codes→
A78Q fever→
A79Other rickettsioses7 codes→

A80-A89Viral and prion infections of the central nervous system (A80-A89)(10)

A80Acute poliomyelitis8 codes→
A81Atypical virus infections of central nervous system12 codes→
A82Rabies3 codes→
A83Mosquito-borne viral encephalitis9 codes→
A84Tick-borne viral encephalitis6 codes→
A85Other viral encephalitis, not elsewhere classified4 codes→
A86Unspecified viral encephalitis→
A87Viral meningitis5 codes→
A88Other viral infections of central nervous system, not elsewhere classified3 codes→
A89Unspecified viral infection of central nervous system→

A90-A99Arthropod-borne viral fevers and viral hemorrhagic fevers (A90-A99)(9)

A90Dengue fever [classical dengue]→
A91Dengue hemorrhagic fever→
A92Other mosquito-borne viral fevers12 codes→
A93Other arthropod-borne viral fevers, not elsewhere classified4 codes→
A94Unspecified arthropod-borne viral fever→
A95Yellow fever3 codes→
A96Arenaviral hemorrhagic fever5 codes→
A98Other viral hemorrhagic fevers, not elsewhere classified7 codes→
A99Unspecified viral hemorrhagic fever→

B00-B09Viral infections characterized by skin and mucous membrane lesions (B00-B09)(10)

B00Herpesviral [herpes simplex] infections17 codes→
B01Varicella [chickenpox]9 codes→
B02Zoster [herpes zoster]18 codes→
B03Smallpox→
B04Monkeypox→
B05Measles9 codes→
B06Rubella [German measles]10 codes→
B07Viral warts3 codes→
B08Other viral infections characterized by skin and mucous membrane lesions, not elsewhere classified27 codes→
B09Unspecified viral infection characterized by skin and mucous membrane lesions→

B10Other human herpesviruses (B10)(1)

B10Other human herpesviruses7 codes→

B15-B19Viral hepatitis (B15-B19)(5)

B15Acute hepatitis A2 codes→
B16Acute hepatitis B4 codes→
B17Other acute viral hepatitis7 codes→
B18Chronic viral hepatitis5 codes→
B19Unspecified viral hepatitis8 codes→

B20Human immunodeficiency virus [HIV] disease (B20)(1)

B20Human immunodeficiency virus [HIV] disease→

B25-B34Other viral diseases (B25-B34)(6)

B25Cytomegaloviral disease5 codes→
B26Mumps12 codes→
B27Infectious mononucleosis20 codes→
B30Viral conjunctivitis6 codes→
B33Other viral diseases, not elsewhere classified11 codes→
B34Viral infection of unspecified site7 codes→

B35-B49Mycoses (B35-B49)(15)

B35Dermatophytosis9 codes→
B36Other superficial mycoses6 codes→
B37Candidiasis20 codes→
B38Coccidioidomycosis10 codes→
B39Histoplasmosis7 codes→
B40Blastomycosis9 codes→
B41Paracoccidioidomycosis4 codes→
B42Sporotrichosis8 codes→
B43Chromomycosis and pheomycotic abscess5 codes→
B44Aspergillosis8 codes→
B45Cryptococcosis7 codes→
B46Zygomycosis8 codes→
B47Mycetoma3 codes→
B48Other mycoses, not elsewhere classified6 codes→
B49Unspecified mycosis→

B50-B64Protozoal diseases (B50-B64)(12)

B50Plasmodium falciparum malaria3 codes→
B51Plasmodium vivax malaria3 codes→
B52Plasmodium malariae malaria3 codes→
B53Other specified malaria3 codes→
B54Unspecified malaria→
B55Leishmaniasis4 codes→
B56African trypanosomiasis3 codes→
B57Chagas' disease14 codes→
B58Toxoplasmosis13 codes→
B59Pneumocystosis→
B60Other protozoal diseases, not elsewhere classified14 codes→
B64Unspecified protozoal disease→

B65-B83Helminthiases (B65-B83)(19)

B65Schistosomiasis [bilharziasis]6 codes→
B66Other fluke infections8 codes→
B67Echinococcosis17 codes→
B68Taeniasis3 codes→
B69Cysticercosis6 codes→
B70Diphyllobothriasis and sparganosis2 codes→
B71Other cestode infections4 codes→
B72Dracunculiasis→
B73Onchocerciasis6 codes→
B74Filariasis7 codes→
B75Trichinellosis→
B76Hookworm diseases4 codes→
B77Ascariasis5 codes→
B78Strongyloidiasis4 codes→
B79Trichuriasis→
B80Enterobiasis→
B81Other intestinal helminthiases, not elsewhere classified6 codes→
B82Unspecified intestinal parasitism2 codes→
B83Other helminthiases7 codes→

B85-B89Pediculosis, acariasis and other infestations (B85-B89)(5)

B85Pediculosis and phthiriasis5 codes→
B86Scabies→
B87Myiasis10 codes→
B88Other infestations8 codes→
B89Unspecified parasitic disease→

B90-B94Sequelae of infectious and parasitic diseases (B90-B94)(4)

B90Sequelae of tuberculosis5 codes→
B91Sequelae of poliomyelitis→
B92Sequelae of leprosy→
B94Sequelae of other and unspecified infectious and parasitic diseases5 codes→

B95-B97Bacterial and viral infectious agents (B95-B97)(3)

B95Streptococcus, Staphylococcus, and Enterococcus as the cause of diseases classified elsewhere11 codes→
B96Other bacterial agents as the cause of diseases classified elsewhere18 codes→
B97Viral agents as the cause of diseases classified elsewhere24 codes→

B99Other infectious diseases (B99)(1)

B99Other and unspecified infectious diseases2 codes→