FWIW, with a cancer diagnosis in the US, we also had GNP insurance in Mexico who had one of the top oncologist/hematologists in Jalisco in their network. I forget his credentials but it was something like President of the Council of Hematologists in Jalisco. Exact same diagnosis and exact same treatment protocol as the US. Our Gold Plan BCBS policy in the US required that we wait until Stage 3 for treatment. Got cancer, good luck with that
Due diligence on your part and luck is your friend when it comes to health care here or there.