Secondary PD is a form of Parkinsonsim that is related to another primary cause. For example, welding causes a manganese toxicity that looks very much like PD. There are over 50 conditions or disease states that come along with PD motor symptoms. Obviously, insurers aren't going to support being checked for every little thing; hence, we have the handy umbrella of Idiopathic PD. This is my opinion only, but the research shows over and over that PD has many different origins. I don't think you would find much relief in having this diagnosis; it raises more questions than it answers.