David,
Absolutely NOT!!! Drs certified by USCIS to offer this medical actually use this as a cash cow, because all insurance companies will deny to pay for this type of medical service.... Your PCP could be certified...but he or she is going to demand $$$ from you, not through the insurance co. However, if he or she tells you that you should pay, and claim the reimbursement through your health insurance, get the hell out of his/her office and run....
I mean, even if you were sitting on a bed naked waiting for the examination, because your health insurance is going to nicely deny your medical claim for I-693... he or she is lying...

It is possible that your health insurance can cover the chest X-ray for TB, because hey paid for mine......

Again, check with your provider...
My PCP was certified to do medical by USCIS, but he wanted about $390.00 and I told him that he should shove it... I did it at my own expense for about $100 or so... don't remember the exact cost.... You best bet is to go and do it as a local medical facility which could charge less than private drs. In VA, there is a facility which charges about $75.00 for the entire I-693 medical...