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He doesn't need to submit proof. Let's say client turned 65 on 1/1/23 and kept working and didn't need to pick up Part D. Then he retires and joins Part D 1/1/24. CMS and the plan would see that as a 12-month gap that needs to be accounted for. The plan sends a letter "hey did you have creditable coverage during these 12 months? If yes, pick the source from this form and fill in the dates." The form can be returned or the info can even be given over the phone.
You're missing a piece of the puzzle here.
Learned this recently, but all they have to do is say, yes I've had coverage. You don't have to prove it. I always thought you had to show proof.
I finally found the form I received from SilverScript. On the form I received, In addition to checking the box, there was also a specific request for the name of the coverage.
See the first section after heading information on page 52 of this link:
That is what the form I received from SilverScript looked like.