There's a lot of pages out there about debunking Canadian healthcare myths, and this is another good one. For example, Canadians come to the US for healthcare:

Most patients who come from Canada to the U.S. for health care are those whose costs are covered by the Canadian governments. If a Canadian goes outside of the country to get services that are deemed medically necessary, not experimental, and are not available at home for whatever reason (e.g., shortage or absence of high tech medical equipment; a longer wait for service than is medically prudent; or lack of physician expertise), the provincial government where you live fully funds your care.