"We can confirm that Artie is in the hospital," Lange's reps said in a statement. "Artie has chosen to keep all information on this matter between him and his doctor. There will be no further comment."
The comedian, 42, has been absent from Stern's satellite radio show since early December and canceled several stand-up engagements during that time. According to his schedule, Lange's upcoming performances in late January and February have also been called off.
The MADtv alum has a history of substance abuse and was arrested for a DUI in 2009 for prescription sleeping pills, according to E!