How Long Is Medicare Primary For Esrd? 
Not everyone with ESRD is covered by Medicare , but if you are eligible Medicare will be the primary payer in the following situations . If Medicare is your only health insurance , Medicare is primary . If you have coverage through an employer group health plan , that plan is primary -LRB- if there are 20 or more employees -RRB- during a 30 month COB period . At the end of the COB period Medicare is primary . 