I have a brother who would not get health insurance as he probably felt he could not afford it as he worked as a home health aid. Advice?

Don't worry about the medical bills unless he owns property and lives in a State that will allow the hospital to go after it. Many years ago my father had a similar situation, had a major stroke with no health insurance. Fortunately he was able to recover quite a bit to the point of being able to drive, but was still not able to work. Once you're disabled, you basically live off of SSDI and Medicare/Medicaid and are basically judgement proof from the medical bills. The SSDI, which will transition to SS, is not touchable by creditors or medical bills. The issue will become his level of independence and where he will be able to live. He may not be able to live on his own, either because he will need support due to his medical issues or because he can't afford it. If he can't afford it but can live independently in the future, he will need to find an apartment that takes a percentage of his income for rent. There may be a waiting list for an apartment such as this. If he doesn't recover enough to be able to live independently, then either he will family will take him in, or if family is unable to take on that responsibility, then he will have to go to a facility, likely a nursing home, paid by LTC Medicaid.

59, no poa, back in hospital, still out of it, mostly sleeping, cannot talk other than yes and no. WE are applying for aid. Just wondering what others have done.

More info would be helpful: how old is your brother? Are you his PoA? Where is he now? What is his current physical and mental condition?

In terms of his "over half a million in bills" he can apply for Medicaid and someone (even if they are not his PoA) can help him do this but would need access to get bank statements and assets info. If he has no assigned PoA then a social worker can be engaged to help him.