If a person is on Medicare all claims must go to Medicare.
I guess the senior can go to a doctor and pay for the services in cash and request that the doctor not send the claim to Medicare. I don't know why any Medicare patient would do that though. I don't see any benefit to the senior.
Maybe I didn't understand exactly what you were asking.
Frank, perhaps you might explain the concept of "assignment" to those who seem to have a problem with this. I would, but you will do a better job than I.
I think too many agents completely miss the point about "Medicare assignment".