The right-hander, 28, was a staple in a Phillies bullpen that was the best in the National League in 2008, going 4-2 with a 3.05 ERA in 76 appearances.
Madson, who avoided arbitration last offseason and made $1.4 million in 2008, is one of eight Phillies who filed for arbitration prior to Thursday's deadline. Madson and outfielder Jayson Werth will be free agents after the 2009 season.
With left-hander J.C. Romero suspended the first 50 games of the 2009 season after testing positive for a performance-enhancing substance under Major League Baseball's Drug Policy, Madson's presence in the bullpen becomes even more valuable.
Alden Gonzalez is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.