I doubt that we would arrive at a situation in which we would dictate specifically, as a condition of federal funding, what forms of care are required to be provided by any individual or by provinces and territories collectively. Medical necessity, generally speaking, although it's referenced in the Canada Health Act, is left to provinces to define. Provinces and territories, as a condition of receipt of federal funding through the Canada health transfer, are obligated to provide “medically necessary” services, but, as I say, the act does not define those.
What tends to happen is that as certain forms of service provision come into vogue and are widely practised in most jurisdictions, if there is a circumstance whereby a jurisdiction has chosen not to provide that service, that issue then becomes or could become a topic of conversation between the federal government and that province. The comprehensiveness principle is really about the provision of services at what is the generally accepted standard of care in the country.