Once again the confusion of terms leads the debate and the reporting.  HEALTH CARE is not the same as HEALTH INSURANCE.  Having single payer does not mean that anyone will have adequate health care or health treatment.
As a "senior citizen", I have Medicare (A&B) and I went in when I turned 65 and had my "Welcome to Medicare" checkup and physical.  This year I made an appointment for another annual checkup, only to discover that after the "Welcome" exam, a yearly checkup isn't covered by A or B Medicare.  The Nurse also informed me that her father (hearsay I admit), has been told that treatment for cancer of the throat will not be given after he turns 75.  I was also told that applies for all cancer treatment, ceases at 75, unless you have an individual GAP plan.  Luckily I do, under a retiree Insurance program from my former employer.  
Health Insurance is not Health Care!