When you are injured in a car accident, there are usually two parts to your claim – (1) an accident benefits claim; and (2) a claim against the other driver (which is secretly defended by the other driver’s insurer). Both of those companies have the right to not listen to treating doctors and to, instead, hand-pick medical doctors, pay them and send you to see those doctors for opinions. Many insurer’s have “rosters” of assessors and only include (and keep) the doctors that they wish on that roster.
http://law123.ca/insurance-ass