The director's French lawyer says that the 76-year-old director is receiving medical treatment for an undisclosed ailment, according to Reuters.
"All I know is that he has been taken from prison for medical attention. I don't know where he is or when he will be returned to prison," lawyer Herve Temime said.
Wherever the director is, he's still under supervision.
"He is still in detention. If necessary he has all the medical care (needed). It can be in prison or in hospital, in general," a spokesperson for Switzerland's Federal Office of Justice told the news agency.
Having been denied bail, the Oscar-winner has been in a Swiss jail since last month awaiting an extradition hearing to decide whether he will be returned to the United States.
Polanski fled the United States in 1978 before he could be sentenced for having sex with a 13-year-old girl in California.

Mini Biography  for Roman Polanski

Roman Polanski's parents returned to Poland from France just two years before the World War II began: both were taken later to concentration camps where his mother eventually died. Young Roman managed to escape the ghetto and learned to survive wandering through the Polish countryside and living with the different Catholic families. Though local people usually ignored cinemas where mostly German films were shown, Polanski seemed not very much concerned about patriotism and frequently went to the movies. In 1945, he reunited with his father who sent him to technical school, but young Polanski seemed to have already made his choice.

In the 1950s, he took up acting, appearing in Andrzej Wajda's Pokolenie (1955) before studying at the Lodz Film School. His early shorts such as Dwaj ludzie z szafa (1958), Le gros et le maigre (1961), and Ssaki (1962) showed his taste for black humor and interest in bizarre human relationships. His feature debut, Nóz w wodzie (1962), was the first Polish post-war film not associated with the war theme. Though being already a major Polish filmmaker, Polanski yet chose to leave the country and headed to France. Being down-and-out in Paris, he befriended young scriptwriter, Gérard Brach, who eventually became his long-time collaborator. The next two films, Repulsion (1965) and Cul-de-sac (1966), made in England and co-written by Brach, won respectively Silver and Golden Bear at the Berlin Film Festivals.

In 1968, Polanski went to Hollywood, where he made the psychological thriller Rosemary's Baby (1968). However, after the brutal murder of his wife Sharon Tate by the infamous Manson gang in 1969, the director decided to return to Europe. In 1974, he again appeared with a US release of Chinatown (1974). It seemed the beginning of the promising Hollywood career, but after his conviction for the statutory rape of a 13-year old girl, Polanski fled from America to avoid prison.

After Tess (1979), which was awarded several Oscars and Cesars, his work became intermittent and rarely approached the level of his better known films. The director also stretched his talents to include occasional work in theatre. He still likes to act in the films of other directors, sometimes with interesting results as it was in Una pura formalità (1994).