The US' healthcare model is not unique, and almost no countries have zero-cost-to-consumer healthcare systems (and none of them are free -- they're just paid by taxpayers instead of consumers). "Free" healthcare is the exception rather than some kind of international norm you incorrectly make it out to be.
The first step to reforming US healthcare is actually understanding it, and understanding some international designs. Lying about it doesn't help.
Not a single soul on earth thinks single payer healthcare is free. 8 billion people, not one of them thinks it.
They mean “free to the consumer at time of service”, which it is. Nobody is lying, everyone agrees, it’s just you who doesn’t understand.