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.
Also know that in northern BC or remote areas of Yukon, if you need an emergency ambulance, it is possible that vehicle will be a helicopter.
Fixed wing aircraft are often used to transport emergency cases from a community with an airstrip to a community where appropriate care can be provided.
In an extreme case, a patient may be transported by air from Whitehorse to Vancouver for treatment.
Therefore, "ambulance" charges can be high in some instances.