Reports emanated late on Tuesday night that Schumacher, who is being slowly brought out of an induced coma, had contracted pneumonia.
However, Kehm told German news agency DPA that those reports were speculation.
“As always, my answer is: announcements about Schumacher’s health status, that are not done by his official doctors or by his management need to be treated as speculation,” she said.
Schumacher landed head-first on a rock after he lost his footing while skiing off-piste in December and has been in a critical condition ever since.
Reports had suggested that Schumacher’s chances of a full recovery were to diminish the longer he was held in the induced coma.
Jean-Marc Orgogozo, professor of neurology at the University of Bordeaux, was quoted by the Daily Mirror as saying: “Every day, every week in a coma the chances decline that the situation is improving.”
French police have said Schumacher was not skiing recklessly when he crashed and hit his head on a rock.