The way the GST/HST legislation is set up, there is an exemption for all services covered by provincial and territorial health care plans. Anything that falls under and is covered by one of those plans has been and will continue to be exempt.
There is also an exemption for the services of various health care professionals: psychologists, doctors, all the major health care professionals. If you are regulated in five or more provinces, the practice is that you're added to this list, so there's an extensive list of all the major health care professionals. The services provided by those health care professionals, if they're in the context of providing a medical service, a medical treatment, have been and will continue to be exempt.