- Arterionephrosclerosis (see also Hypertension, kidney) 403.90
- Arteriopathy 447.9
- Arteriosclerosis, arteriosclerotic (artery) (deformans) (diffuse) (disease) (endarteritis) (general) (obliterans) (obliterative) (occlusive) (senile) (with calcification) 440.9
- Arteriospasm 443.9
- Arteriovenous - see condition
- Arteritis 447.6
- Artery, arterial - see condition
- Arthralgia (see also Pain, joint) 719.4
- Arthritis, arthritic (acute) (chronic) (subacute) 716.9
- Arthro-onychodysplasia 756.89
- Arthro-osteo-onychodysplasia 756.89
- Arthrocele (see also Effusion, joint) 719.0
- Arthrochondritis - see Arthritis
- Arthrodesis status V45.4
- Arthrodynia (see also Pain, joint) 719.4
- Arthrodysplasia 755.9
- Arthrofibrosis, joint (see also Ankylosis) 718.5
- Arthrogryposis 728.3
- Arthrokatadysis 715.35
- Arthrolithiasis 274.0
- Arthropathy (see also Arthritis) 716.9
- Arthrophyte (see also Loose, body, joint) 718.1
