Medicare has worked for 65 year olds, and up. Extend the principle and modify the details for everyone with a Social Security number.
Why is this important?
Both major parties have struggled trying to re-invent a new type of healthcare coverage that achieves certain goals when a mutually agreed upon healthcare coverage method already exists! It needs to be extended to all qualified Americans.
The basics will automatically be covered, but leaves room for supplimentary coverages through private carriers.