For Canadians living in BC, I understand that for instance BC Medical is good for all across Canada.
My wife required help in an Ontario hospital and it was covered by our BC Medical Plan.
As I understand it, transportation from anywhere in Canada back to BC would not be covered.
For years I have been buying extra insurance through BCAA when going to Europe.
BCAA advised me also to buy their insurance when we stay in Canada. But I decided to refuse doing that. Any transportation across Canada would have to be paid out of my own pocket, which I can pay for. Our doctors and hospital services are covered across Canada by BC Medical.