OK, here it is. I've linked to a PDF with the full legislative text at the bottom of this blog entry; here's the summary version, with some notes:
TITLE I—ESTABLISHMENT OF THE UNIVERSAL MEDICARE PROGRAM
Establishes a Universal Medicare Program for every resident of the United States, including the District of Columbia and the territories. Guarantees patients the freedom to choose their health care provider. Provides for the issuance of Universal Medicare cards that all residents may use to get the health care they need upon enrollment. Prohibits discrimination against anyone seeking benefits under this act.
OK, so it apparently would cover undocumented immigrants, and every doctor/hospital/clinic/etc. would be required to participate, with anyone in the country being covered by any healthcare provider nationally.
For the past year and a half, of all the proxy battles between "Team Hillary" and "Team Bernie" on the left side of the aisle, no issue has been more repsentative of both how passionate people are or how much each "side" misunderstands the other than the future of the American healthcare system.
"Team Bernie", in essence, consisted of progressives (and Democrats) who believe that while the ACA may have improved things to some degree in some ways, it not only isn't enough long-term, it isn't nearly enough short-term either; the next step (and for many, the only acceptable next step) must be moving the entire U.S. population over to a universal Medicare-style Single Payer system, with everyone in the country being covered through a single, comprehensive healthcare program funded entirely (or nearly entirely) by taxes.