I don’t mean to sound flip, but can you move them to another country? That would be cheaper than trying to help from overseas. They’ll need an advocate to fight for them every step of the way and keep all the info recorded and searchable. Oftentimes mental sluggishness – if not outright dementia issues – makes navigating the medical system particularly difficult for senior citizens.
Another option is to at least move them to a better state. Medicare coverage, and medical facilities in general, can vary greatly from state to state. And if you’re following the news, even Medicare (which is supposed to be federal) is severely curtailed now in red states.
It is possible that in the right state, with the right Medicare coverage and possibly an add-on policy through the ACA marketplace, you would be able to cover assisted living and hospice care. Not at the nicest of facilities probably, but they wouldn’t be out on their asses. In the right state, that is.
If there is a major university nearby, there might be clinical trials they could join. These trials include a lot of the ongoing diagnostics that otherwise aren’t covered by insurance.
Having said that…medical trials aren’t a guarantee. A friend was just telling me yesterday that her breast cancer/uterine cancer trial changed their protocols and dropped her as no longer fitting their needs, which means now the regular uterine ultrasounds she’s been having will no longer occur, her insurance won’t pick them up, and since she had to cut her 5 years of tamoxifen short because of dangerous side effects she’s actually in acute risk of developing uterine cancer now, with no way to afford staying on top of it to catch it early enough. So, yeah.