Med Advantage with CHAMP-VA

I received this woman as a referral. She currently has Original Medicare and Champ VA. It has been many years ago that I encountered someone like this. I remember that I left it alone. This woman had UHC HMO about a year ago and said that she paid only $9 out of pocket for a 15- day hospital stay. I'm sure that the CHAMP VA acts as a secondary to the MA. But, how would it work in specialist office COPAYS where a $dollar amount is involved?
Has anyone encountered and prospects with this sort of coverage?

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