- Anomia 784.69
- Anonychia 757.5
- Anophthalmos, anophthalmus (clinical) (congenital) (globe) 743.00
- Anopsia (altitudinal) (quadrant) 368.46
- Anorchia 752.89
- Anorchism, anorchidism 752.89
- Anorexia 783.0
- Anosmia (see also Disturbance, sensation) 781.1
- Anosognosia 780.99
- Anosphrasia 781.1
- Anosteoplasia 756.50
- Anotia 744.09
- Anovulatory cycle 628.0
- Anoxemia 799.02
- Anoxia 799.02
- Anteflexion - see Anteversion
- Antenatal
- Antepartum - see condition
- Anterior - see also condition
- Antero-occlusion 524.24
- Anteversion
- Anthracosilicosis (occupational) 500