Skin Exam during annual physical with General Practitioner preventive care?

So I am aware that if you are going to get a skin exam via a dermatologist it is not considered a preventive care exam (and you have to pay a co pay or whatever the price is before HSA).

I was told by my insurance though I can request a skin check during my annual physical and they can mark it as preventive. Has anyone done this and is it a thorough exam. Was there any issues with them trying to charge you?