[0]: https://en.wikipedia.org/wiki/Healthcare_in_North_Korea#Heal...
The problem necessitating bureaucracy in a separate system for the poor on top of the US’s mostly-private-pay health care system is identifying who is eligible and what they legally deserve.
That’s where having a separate system for the medically indigent in a mostly prvate-pay system becomes much more burdensome, per covered person, than a universal coverage system without private insurance.
Cross-country comparisons are dicey at the best of times because a whole stack of basic cultural assumptions are violated. Unless there is a thriving medical tourism trade to NK it is unlikely that any American would benefit from copying North Korea.
There is a long list of about about 150 countries that they could look to before even brushing against the idea of looking to North Korea for good ideas.