Conductor Julien Salemkour substituted for Barenboim at a special concert marking Mozart's 250th birthday at the Staatskapelle on Friday.
Barenboim is due to begin a U.S. tour with the Staatskapelle on February 3; it is unclear whether it will be rescheduled. The spokeswoman said, "The U.S.A. tour is not yet canceled, we're waiting on the examinations, which are ongoing."