Has anyone heard crps refered to as a waste basket diagnosis?

I was seeing an Ortho who did surgery on my shoulder then started treating my hand. He injected it the most he could and asked that I go see a hand specialist. I saw said specialist and got my crps diagnosis.
So yesterday I was in with my dr at the old Ortho (I've always liked him) and I let him know I had a bone scan and told him what the hand specialist said. He replied "that's a waste basket diagnosis"

Is this the common thought with drs about this diagnosis? What's your experience with drs recognizing this syndrome?

I was unsure what my gp would have to say about the diagnosis and after Ortho docs comment I feel reluctant to tell her. I did however get a referral to a pain management center and I am going to talk to them about this. Surely a pain specialist will not scoff at the diagnosis.

Pardon my typos. My typing hand is my affected hand.
Jenni