Back in 1965 the Democrats had supermajority control of both the House and Senate:  Dems (295) Republicans (140).  history.house.gov/Congressional-Overview/Profiles/89th/

The Democrats created and passed Medicare with the following vote tally.  President Johnson signed the bill into law at a special ceremony in Independence, Missouri on July 30, 1965.  https://www.ssa.gov/history/tally65.html

Summary of Party Affiliation on Medicare Vote:

Senate Democrats Yea (57) Nay (7)  Not Voting (4);   Republicans Yea (13)  Nay (17)  Not Voting (2)              
House  Democrats Yea (237)  Nay (48)  Not Voting(8);  Republicans Yea (70)  Nay (68)  Not Voting (2)

If history repeats itself, it is likely that our nation won't have a healthcare system under Republican control.