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Also because my hospital is listed under CAH that MBSC wrote about would explain the footnote on my Medicare statement that the amount Medicare paid was reduced due to federal, state and local rules.
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I see that footnote routinely on almost all of my charges even when the bill works exactly the way I expect it:
big initial charge, reduction by factor of 2-3 for Medicare approved charge,
80% paid by Medicare; 20% Max charge to patient.
so it doesn't only apply to strange situations like yours.