Sorry for your incident. My insurance comment would be in line with everyone else.
Would you mind giving everyone an idea on what treatment you received and what you wound up paying out of pocket jet up front? Also where you received treatment.
I would not take a chance even if it was/is legal. All you need to happen is to get pulled out of line and get accused of being a money laundering kingpin or just having it seized under some BS premis. Are you going to fight to get your money back on foreign soil? Good luck with that. But that's just me.