The letters at the end of your Medicare card indicate your beneficiary status. Most will have either and A or a B at the end of their number.
If you have an A at the end you were a primary wage earner, a B, you are the spouse of a wage earner. A T at the end means you are not receiving SS benefits
If you have an A at the end you were a primary wage earner, a B, you are the spouse of a wage earner. A T at the end means you are not receiving SS benefits