- Felon (any digit) (with lymphangitis) 681.01
- Felty's syndrome (rheumatoid arthritis with splenomegaly and leukopenia) 714.1
- Feminism in boys 302.6
- Feminization, testicular 259.5
- Femora vara 736.32
- Femoral hernia - see Hernia, femoral
- Femur, femoral - see condition
- Fenestrata placenta - see Placenta, abnormal
- Fenestration, fenestrated - see also Imperfect, closure
- Fenwick's disease 537.89
- Fermentation (gastric) (gastrointestinal) (stomach) 536.8
- Fernell's disease (aortic aneurysm) 441.9
- Fertile eunuch syndrome 257.2
- Fertility, meaning multiparity - see Multiparity
- Fetal alcohol syndrome 760.71
- Fetalis uterus 752.3
- Fetid
- Fetishism 302.81
- Fetomaternal hemorrhage
- Fetus, fetal - see also condition
- Fever 780.6
- Fibrillation
