How Does Medicare Work When It Is A Secondary Insurance? 
When Medicare is secondary then your primary will pay first . Medicare will then pay their share of the cost . Conversely , if Medicare is Primary the opposite is true , your Medicare will pay first and your secondary pays its share afterward . In some situations this could result in 100 % of you bill being paid after each pays its share.You will not , however , get more money than the total claimin either case . 