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I went the credit card route too and TAP didn't contest a full cash refund. I am very glad I didn't take vouchers from them (or several other airlines) as I would have been out $$$ given what their expiration date would have been.
So your supplement isn't a generally available "Medicare supplement" per se but something your former employer chooses to provide. As far as publicly available Medicare Advantage or Medigap plans go - which are regulated by the federal government - I think the previously mentioned $50k limit is...
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