- Fossa - see also condition
- Foster-Kennedy syndrome 377.04
- Fothergill's
- Foul breath 784.99
- Found dead (cause unknown) 798.9
- Foundling V20.0
- Fournier's disease (idiopathic gangrene) 608.83
- Fourth
- Foville's syndrome 344.89
- Fox's
- Fox-Fordyce disease (apocrine miliaria) 705.82
- Fracture (abduction) (adduction) (avulsion) (compression) (crush) (dislocation) (oblique) (separation) (closed) 829.0
- Fragile X syndrome 759.83
- Fragilitas
- Fragility
- Fragmentation - see Fracture, by site
- Frambesia, frambesial (tropica) (see also Yaws) 102.9
- Frambeside
- Frambesioma 102.1
- Franceschetti's syndrome (mandibulofacial dysostosis) 756.0
- Francis' disease (see also Tularemia) 021.9
- Frank's essential thrombocytopenia (see also Purpura, thrombocytopenic) 287.39
