Medicare Part D

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I have a Union Plan who has a low-level prescription benefit (after about $1,000 it becomes an 90% co-pay). Some participants who are over 65-years old are asking if they can also have MEdicare Part D as a "secondary" to their Rx coverage.

Does anyone know if that's possible? All I've seen is how Medicare Part B works as primary/secondary, but nothing about Part D.

Thanks in advance!