ICD-10-CM
- Waldenström-Kjellberg syndrome
- Wallenberg's disease or syndrome
- Wallgren's disease
- War neurosis
- Wassilieff's disease
- Waterbrash
- Waterhouse (-Friderichsen) syndrome or disease (meningococcal)
- Water-losing nephritis
- Watsoniasis
- Weaver's syndrome
- Weber's paralysis or syndrome
- Weber-Christian disease
- Weber-Cockayne syndrome (epidermolysis bullosa)
- Weber-Gubler syndrome
- Weber-Leyden syndrome
- Weber-Osler syndrome
- Wegner's disease
- Weightlessness (effect of)
- Weil's disease
- Weil (l)-Marchesani syndrome
- Weingarten's syndrome
- Weir Mitchell's disease
- Weiss-Baker syndrome
- Wells' disease
- Wenckebach's block or phenomenon
- Werdnig-Hoffmann syndrome (muscular atrophy)
- Werlhof's disease
- Wermer's disease or syndrome
- Werner's disease or syndrome
- Werner-His disease
- Wernicke-Posadas disease
- West African fever
- Westphal-Strümpell syndrome
- Wheezing
- Whiplash injury
- Whipworm (disease) (infection) (infestation)
- Whistling face
- Whitehead
- Wichman's asthma
- Wide cranial sutures, newborn
- Wilkie's disease or syndrome
- Wilkinson-Sneddon disease or syndrome
- Williams syndrome
- Willige-Hunt disease or syndrome
- Wilms' tumor
- Wilson-Mikity syndrome
- Wiskott-Aldrich syndrome
- Witts' anemia
- Witzelsucht
- Woakes' ethmoiditis or syndrome
- Wolff-Hirschorn syndrome
- Wolff-Parkinson-White syndrome
- Wolhynian fever
- Wolman's disease
- Wood lung or pneumonitis
- Woolly, wooly hair (congenital) (nevus)
- Woolsorter's disease
- Worm-eaten soles
- Worried well
- Worries
- Wright's syndrome
- Wuchereria (bancrofti) infestation
- Wuchereriasis
- Wuchernde Struma Langhans