A ICD-10-CM Categories: Category Index
Browse 85 top-level ICD-10-CM categories beginning with A, then follow their complete FY 2027 child-code hierarchies.
Complete category list
Categories beginning with A
Open a category to continue through its complete hierarchy of more specific codes.
A00Cholera
A01Typhoid and paratyphoid fevers
A02Other salmonella infections
A03Shigellosis
A04Other bacterial intestinal infections
A05Other bacterial foodborne intoxications, not elsewhere classified
A06Amebiasis
A07Other protozoal intestinal diseases
A08Viral and other specified intestinal infections
A09Infectious gastroenteritis and colitis, unspecified
A15Respiratory tuberculosis
A17Tuberculosis of nervous system
A18Tuberculosis of other organs
A19Miliary tuberculosis
A20Plague
A21Tularemia
A22Anthrax
A23Brucellosis
A24Glanders and melioidosis
A25Rat-bite fevers
A26Erysipeloid
A27Leptospirosis
A28Other zoonotic bacterial diseases, not elsewhere classified
A30Leprosy [Hansen's disease]
A31Infection due to other mycobacteria
A32Listeriosis
A33Tetanus neonatorum
A34Obstetrical tetanus
A35Other tetanus
A36Diphtheria
A37Whooping cough
A38Scarlet fever
A39Meningococcal infection
A40Streptococcal sepsis
A41Other sepsis
A42Actinomycosis
A43Nocardiosis
A44Bartonellosis
A46Erysipelas
A48Other bacterial diseases, not elsewhere classified
A49Bacterial infection of unspecified site
A50Congenital syphilis
A51Early syphilis
A52Late syphilis
A53Other and unspecified syphilis
A54Gonococcal infection
A55Chlamydial lymphogranuloma (venereum)
A56Other sexually transmitted chlamydial diseases
A57Chancroid
A58Granuloma inguinale
A59Trichomoniasis
A60Anogenital herpesviral [herpes simplex] infections
A63Other predominantly sexually transmitted diseases, not elsewhere classified
A64Unspecified sexually transmitted disease
A65Nonvenereal syphilis
A66Yaws
A67Pinta [carate]
A68Relapsing fevers
A69Other spirochetal infections
A70Chlamydia psittaci infections
A71Trachoma
A74Other diseases caused by chlamydiae
A75Typhus fever
A77Spotted fever [tick-borne rickettsioses]
A78Q fever
A79Other rickettsioses
A80Acute poliomyelitis
A81Atypical virus infections of central nervous system
A82Rabies
A83Mosquito-borne viral encephalitis
A84Tick-borne viral encephalitis
A85Other viral encephalitis, not elsewhere classified
A86Unspecified viral encephalitis
A87Viral meningitis
A88Other viral infections of central nervous system, not elsewhere classified
A89Unspecified viral infection of central nervous system
A90Dengue fever [classical dengue]
A91Dengue hemorrhagic fever
A92Other mosquito-borne viral fevers
A93Other arthropod-borne viral fevers, not elsewhere classified
A94Unspecified arthropod-borne viral fever
A95Yellow fever
A96Arenaviral hemorrhagic fever
A98Other viral hemorrhagic fevers, not elsewhere classified
A99Unspecified viral hemorrhagic fever
Transparency
Source and release
This category index is generated from Vero’s repository-backed ICD-10-CM hierarchy. Every listed category is a top-level record, and each linked category page exposes its direct child codes.
Review the CDC/NCHS ICD-10-CM sourceCategory navigation
Frequently asked questions
Which ICD-10-CM categories begin with A?
This index lists 85 top-level categories beginning with A from Vero’s FY 2027 U.S. ICD-10-CM reference dataset.
How do I find a more specific A code?
Open a category below, then follow its linked child-code hierarchy until you reach the code supported by the documentation.
Which ICD-10-CM release does this A index use?
The index uses the FY 2027 U.S. ICD-10-CM release and the repository-backed hierarchy displayed on each linked code page.
Is every A category billable?
No. These are top-level categories used for navigation. Follow the hierarchy to a sufficiently specific code and confirm the active code set, official guidance, and payer requirements.
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