Covered under your or your spouses employer plan?

So, you are turning 65 or you are eligible for Medicare, and you are covered through your current employer’s group insurance, or  through your spouse through their current employer’s group insurance.  But now you are considering if you should get Medicare Part B.  What should you do?  How do you know? One quick note, which Read more about Covered under your or your spouses employer plan?[…]