• Fixation
  • Flaccid - see also condition
  • Flail
  • Flajani (-Basedow) syndrome or disease (exophthalmic goiter) 242.0
  • Flap, liver 572.8
  • Flare, anterior chamber (aqueous) (eye) 364.04
  • Flashback phenomena (drug) (hallucinogenic) 292.89
  • Flat
  • Flatau-Schilder disease 341.1
  • Flattening
  • Flatulence 787.3
  • Flatus 787.3
  • Flax dressers' disease 504
  • Flea bite - see Injury, superficial, by site
  • Fleischer (-Kayser) ring (corneal pigmentation) 275.1 [371.14]
  • Fleischner's disease 732.3
  • Fleshy mole 631
  • Flexibilitas cerea (see also Catalepsy) 300.11
  • Flexion
  • Flexner's
  • Flexner-Boyd dysentery 004.2
  • Flexure - see condition