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.
Categories beginning with A
Open a category to continue through its complete hierarchy of more specific codes.
A00CholeraA01Typhoid and paratyphoid feversA02Other salmonella infectionsA03ShigellosisA04Other bacterial intestinal infectionsA05Other bacterial foodborne intoxications, not elsewhere classifiedA06AmebiasisA07Other protozoal intestinal diseasesA08Viral and other specified intestinal infectionsA09Infectious gastroenteritis and colitis, unspecifiedA15Respiratory tuberculosisA17Tuberculosis of nervous systemA18Tuberculosis of other organsA19Miliary tuberculosisA20PlagueA21TularemiaA22AnthraxA23BrucellosisA24Glanders and melioidosisA25Rat-bite feversA26ErysipeloidA27LeptospirosisA28Other zoonotic bacterial diseases, not elsewhere classifiedA30Leprosy [Hansen's disease]A31Infection due to other mycobacteriaA32ListeriosisA33Tetanus neonatorumA34Obstetrical tetanusA35Other tetanusA36DiphtheriaA37Whooping coughA38Scarlet feverA39Meningococcal infectionA40Streptococcal sepsisA41Other sepsisA42ActinomycosisA43NocardiosisA44BartonellosisA46ErysipelasA48Other bacterial diseases, not elsewhere classifiedA49Bacterial infection of unspecified siteA50Congenital syphilisA51Early syphilisA52Late syphilisA53Other and unspecified syphilisA54Gonococcal infectionA55Chlamydial lymphogranuloma (venereum)A56Other sexually transmitted chlamydial diseasesA57ChancroidA58Granuloma inguinaleA59TrichomoniasisA60Anogenital herpesviral [herpes simplex] infectionsA63Other predominantly sexually transmitted diseases, not elsewhere classifiedA64Unspecified sexually transmitted diseaseA65Nonvenereal syphilisA66YawsA67Pinta [carate]A68Relapsing feversA69Other spirochetal infectionsA70Chlamydia psittaci infectionsA71TrachomaA74Other diseases caused by chlamydiaeA75Typhus feverA77Spotted fever [tick-borne rickettsioses]A78Q feverA79Other rickettsiosesA80Acute poliomyelitisA81Atypical virus infections of central nervous systemA82RabiesA83Mosquito-borne viral encephalitisA84Tick-borne viral encephalitisA85Other viral encephalitis, not elsewhere classifiedA86Unspecified viral encephalitisA87Viral meningitisA88Other viral infections of central nervous system, not elsewhere classifiedA89Unspecified viral infection of central nervous systemA90Dengue fever [classical dengue]A91Dengue hemorrhagic feverA92Other mosquito-borne viral feversA93Other arthropod-borne viral fevers, not elsewhere classifiedA94Unspecified arthropod-borne viral feverA95Yellow feverA96Arenaviral hemorrhagic feverA98Other viral hemorrhagic fevers, not elsewhere classifiedA99Unspecified viral hemorrhagic feverSource and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
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.
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.