The bottom 25% of Americans don't have free health care. They won't be treated for anything that is not an emergency. There is a huge difference. Some die because diseases aren't detected until it is too late.
28% of US population is low-income(<200% federal poverty level) and 21% are covered by Medicaid/CHIP. This leaves 6 percent who are low income and uncovered.
https://files.kff.org/attachment/fact-sheet-medicaid-state-U...