I guess Phil's comment about once a stressor is accepted by the VA can an IMO be used to determine the current severity of the PTSD? If the C&P doctor says "yes, vet has PTSD and I believe it is a mild case" then the vet must get an IMO to contradict that doctor's exam to ask for greater than "mild" disability. Since our VA doctors won't help us we must turn to IMO's or our private doctors. I keep two private doctors on the payroll for just such an event.