You may have wondered how Medicare works with other insurance coverage, such as a group health plan from a former employer or union.
It's an important issue because it determines whether your medical bills are paid correctly and on time.
If you have Medicare and other insurance, always be sure to tell your doctor, hospital, and pharmacy.
When there's more than one insurance payer, certain rules determine which one pays first.
This is what's called "coordination of benefits."
The "primary payer" pays what it owes on your bills first - and then sends the balance to the "secondary payer" to …