What are the best miles cards for big purchases?

Check the terms of the card to ensure that the MCC of the hospital bill does not fall under the exclusion list.

From my knowledge, Citi PremierMiles is excluded.

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If you have a big one-time expenditure coming up, it's highly recommended you look at sign up bonuses to get the most miles out of it. A full listing can be found here: https://milelion.com/credit-cards/current-credi...