什麼時候是醫療保險？
什麼時候是醫療保險？
 If your only health insurance plan is Medicare, then Medicare is primary. When you have a Medicare supplement plan, Medicare is primary and your Medigap plan is secondary. If you have coverage under an employer group health insurance plan, and the employer has fewer than 20 employees, Medicare is primary. If there are 20 or more employees, the group plan is primary and Medicare is secondary.
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