- Tick (-borne) fever NEC 066.1
- Tick paralysis 989.5
- Tick-bite fever NEC 066.1
- Tics and spasms, compulsive 307.22
- Tietze's disease or syndrome 733.6
- Tight, tightness
- Tilting vertebra 737.9
- Timidity, child 313.21
- Tin-miners' lung 503
- Tinea (intersecta) (tarsi) 110.9
- Tingling sensation (see also Disturbance, sensation) 782.0
- Tinnitus (aurium) 388.30
- Tipped, teeth 524.33
- Tipping
- Tiredness 780.79
- Tissue - see condition
- Tobacco
- Tobias' syndrome (carcinoma, pulmonary apex) (M8010/3) 162.3
- Tocopherol deficiency 269.1
- Todd's
- Toe - see condition
- Toilet, artificial opening (see also Attention to, artificial, opening) V55.9