We are currently making arrangements to have him transferred to St. Mungo’s Hospital for Magical Maladies and Injuries.
Chapter 13: The Secret Riddle Katie was removed to St. Mungo’s Hospital for Magical Maladies and Injuries the following day, by which time the news that she had been cursed had spread all over the school, though the details were confused and nobody other than Harry, Ron, Hermione, and Leanne seemed to know that Katie herself had not been the intended target.
"A team of Healers from St. Mungo’s Hospital for Magical Maladies and Injuries are examining him as we speak.
There are no more uses of "malady" in the book.
Show samples from other sources
While in the meantime, cities crumble; education, security, medicine for every other malady known to man, charity, humanitarian aid—the whole world goes to pot so WICKED can do whatever they want to do.
James Dashner -- The Death Cure
I could normally "remove her from her service" for medical reasons, with his permission, of course, but to select her out regularly, and only her, before indications of an illness or malady was unusual indeed.