- Tear stone 375.57
- Tear, torn (traumatic) - see also Wound, open, by site
- Teeth, tooth - see also condition
- Teething 520.7
- Tegmental syndrome 344.89
- Telangiectasia, telangiectasis (verrucous) 448.9
- Telecanthus (congenital) 743.63
- Telescoped bowel or intestine (see also Intussusception) 560.0
- Teletherapy, adverse effect NEC 990
- Telogen effluvium 704.02
- Temper tantrum (childhood) (see also Disturbance, conduct) 312.1
- Temperature
- Temple - see condition
- Temporal - see also condition
- Temporomandibular joint-pain-dysfunction syndrome 524.60
- Temporosphenoidal - see condition
- Tendency
- Tenderness
- Tendinitis, tendonitis (see also Tenosynovitis) 726.90
- Tendon - see condition
- Tendosynovitis - see Tenosynovitis
- Tendovaginitis - see Tenosynovitis