What have you done for medical insurance while traveling in Canada? I am retired military and have Tricare and closing in on Medicare. From what I understand neither are accepted in Canada.
I used to work in a doctor's office in BC. We could not bill US insurance companies directly. We would bill the patient and they would get reimbursed by their insurance company.
When we travel in the US we are covered by 1 our Visa card has travel insurance attached to it, 2 our Extended health benefits have travel insurance.
We have never in years of international and North American travel had to use our travel insurance, but we would not leave home without it.