I'm wanting to have a tummy tuck and breast augmentation - I'm a type 2 diabetic.

Thanks for your question.
I agree with much of what has already been posted in response.  There is not an absolute A1C "cutoff" for surgery.  It is best used as one piece of the puzzle in determining your health and risk for surgery.  If you are otherwise healthy, a non-smoker, exercise regularly you should have a minimal increase in your risk.  That being said, an A1C below 7 as been shown to reduce infection and wound healing problems.  Be sure to consult with your physician to try and optimize your glycemic control prior to any surgery.
Best wishes.

 I appreciate your concern, and diabetes does somewhat increase the chance for complications with mommy makeover surgery, specifically Tummytuck  and if breast lift or reduction is needed. I have successfully operated on diabetics, but precautions need to be taken and risks understood.  Your first step would be to obtain medical clearance from your doctor and be certain that your diabetes is well controlled. Seek out a board-certified plastic surgeon to increase your chances of the best possible result because your case is complicated. Your surgeon may have to be more conservative with your tummy tuck and understand that wound healing after surgery may be a problem but one that can be overcome. Best of luck.