The cost of the requalification would be to have the doctors fill out the forms. Even though the government does pay the doctor to do that, they always charge the patient as well to fill out the forms. For the actual requalification, there is a cost for the doctors to do the forms.
On the health care, when you're on CPP disability and living in poverty, the only health care coverage you have is OHIP, so all your health care costs are out of pocket.