medicare refused payment on a claim-I do not understand why?

Answer 1

Was what you were making a claim on covered by Medicare? Did you need prior approval to get this claim approved? Did you fill out the paperwork wrong?

There is not enough evidence to make any conclusion from your question.

Answer 2

We'd need to know what the service was, and the reason they gave for denying. It could be that it required pre-authorization and you didn't do that, or it was a service that isn't covered, or that service was rendered out of the US (medicare/aid doesn't cover any services outside the US), or numerous other reasons.

Answer 3

There is number on your medicare notice to call for an explanation.

Answer 4

Call them and find out.