- Agranulocytopenia (see also Agranulocytosis) 288.09
- Agranulocytosis (see also Neutropenia) 288.09
- Agraphia (absolute) 784.69
- Agrypnia (see also Insomnia) 780.52
- Ague (see also Malaria) 084.6
- Agyria 742.2
- AHTR (acute hemolytic transfusion reaction) - see Complications, transfusion
- Ahumada-del Castillo syndrome (nonpuerperal galactorrhea and amenorrhea) 253.1
- AIDS 042
- AIDS virus (disease) (illness) 042
- AIDS-associated retrovirus (disease) (illness) 042
- AIDS-associated virus (disease) (illness) 042
- AIDS-like disease (illness) (syndrome) 042
- AIDS-related complex 042
- AIDS-related conditions 042
- AIDS-related virus (disease) (illness) 042
- Ailment, heart - see Disease, heart
- Ailurophobia 300.29
- AIN I (anal intraepithelial neoplasia I) (histologically confirmed) 569.44
- AIN II (anal intraepithelial neoplasia II) (histologically confirmed) 569.44
- AIN III (anal intraepithelial neoplasia III) 230.6
- Ainhum (disease) 136.0
