Since retiree benefits differ, it depends. You should check with the company providing you with retiree benefits before joining a Medicare private health plan
Your Medicare private plan pays first, and your retiree coverage pays second. Depending upon the terms of your retiree health plan, it can pay your Medicare private plan co-pays and deductibles, and even provide additional benefits.
To learn more about your costs in Original Medicare and in a Medicare private health plan, click on the links in the GO TO box.
In some cases, however, you only can get your retiree benefits if you join a Medicare private health plan with which your former employer contracts.