A feud between UW Health and Meriter Health Services has escalated into a court battle, with UW?s doctor group filing a lawsuit Friday against Meriter over Meriter?s decision to stop providing doctors to oversee patients at night who are treated during the day by UW doctors. The UW Medical Foundation filed the suit in Dane County Circuit Court. It says Meriter made it harder for UW to fill the night coverage gap by refusing to let more UW doctors work at Meriter and by hiring some of the UW doctors.