The 30-month coordination period begins on the first date you become entitled to enroll in Medicare due to ESRD. During this time Medicare can be the secondary payer for 30 months. Find Medicare Plans in 3 Easy Steps We can help find the right Medicare plans for you today The coordination period to receive Medicare for ESRD is beneficial for those with employer, COBRA, or retiree coverage. For ESRD patients without other insurance, Medicare is primary at the time of enrollment.