Here are some, of the Hospitals in Mexico, by the way, the last visit that Busch made to Mexico, he was treated on this Hospital, I Know because I was there giving Birth:
http://www.abchospital.com/en/accreditations/joint-commission-international-jci
http://www.medicasur.com.mx/
http://www.beneficenciaespanola.com.mx/
and this Hospital, is conciderated the best hospital in ALL LATIN AMERICA:
www.hospitalangeleslomas.com
So I don´t know who is the source of your information, but in that area ,you are mistaken, and of course, if I get sick, and, if I go to the Hopital in the USA, I won´t be let go, if I don´t pay, because I am not in the same health plan that you have, and that happens all over the globe. Probably the persons that you talk , doesn´t have a health plan, and that is scary everywere, and no, if I had to be hospitalized, the rule is that if you are discharge before 1 night, then you have to pay directly to the hospital, but if you have at least one night there, the insurance pays directly to the hopital. If you are a worker, then, they have their own hopitals where they dont have to pay anything at all, they pay monthly a small amount for the insurance, and their boss pays monthly 4 times more to get them insure.