- Allen-Masters syndrome 620.6
- Allergic bronchopulmonary aspergillosis 518.6
- Allergy, allergic (reaction) 995.3
- Allescheriosis 117.6
- Alligator skin disease (ichthyosis congenita) 757.1
- Allocheiria, allochiria (see also Disturbance, sensation) 782.0
- Almeida's disease (Brazilian blastomycosis) 116.1
- Alopecia (atrophicans) (pregnancy) (premature) (senile) 704.00
- Alpers' disease 330.8
- Alpha thalassemia 282.43
- Alpha-lipoproteinemia 272.4
- Alphos 696.1
- Alpine sickness 993.2
- Alport's syndrome (hereditary hematurianephropathy-deafness) 759.89
- ALPS (autoimmune lymphoproliferative syndrome) 279.41
- ALTE (apparent life threatening event) in newborn and infant 799.82
- Alteration (of), altered
- Alternaria (infection) 118
- Alternating - see condition
- Altitude, high (effects) - see Effect, adverse, high altitude
- Aluminosis (of lung) 503
- Alvarez syndrome (transient cerebral ischemia) 435.9
