Medicaid isn't available for poor people without a disability in every state. This article is a couple of years old (it is now 10 states that haven't expanded Medicaid instead of 12), but the coverage gap is real.

I'm aware. That doesn't mean you actually get healthcare though. Most places won't take it. Those that do either have long waiting lists or won't actually give decent treatment. It's rare if not impossible to find a decent provider that takes Medicaid in my area, even just for primary care.