- Trichophytide - see Dermatophytosis
- Trichophytobezoar 938
- Trichophytosis - see Dermatophytosis
- Trichoptilosis 704.2
- Trichorrhexis (nodosa) 704.2
- Trichosporosis nodosa 111.2
- Trichostasis spinulosa (congenital) 757.4
- Trichostrongyliasis (small intestine) 127.6
- Trichostrongylosis 127.6
- Trichostrongylus (instabilis) infection 127.6
- Trichotillomania 312.39
- Trichromat, anomalous (congenital) 368.59
- Trichromatopsia, anomalous (congenital) 368.59
- Trichuriasis 127.3
- Trichuris trichiuria (any site) (infection) (infestation) 127.3
- Tricuspid (valve) - see condition
- Trifid - see also Accessory
- Trigeminal neuralgia (see also Neuralgia, trigeminal) 350.1
- Trigeminoencephaloangiomatosis 759.6
- Trigeminy 427.89
- Trigger finger (acquired) 727.03
- Trigonitis (bladder) (chronic) (pseudomembranous) 595.3
