Might be interesting to check how much "Medical Tourism" happens between US and other countries. This might be an interesting industry to get into. If I remember well there was a health insurance company that was promoting Medical Tourism for their clients
That was my thought. If I had the money, I would setup one or two clinics in Nuevo Laredo, Reynosa, Juarez or Tijuana, fill it with really good, English speaking health professionals and promote the heck out of it in the USA for medical tourism.
There are laboratories even at walking distance of the USA haha ( https://www.google.com/search?tbs=lf:1,lf_ui:4&tbm=lcl&q=lab... )