For cosmetic surgery risk may also take into consideration the surgeons reputation if patient died on table as it would not be normal in cosmetic surgery whilst if life or death surgery the risk would be acceptable I think the risk is considered high for Diabetics no matter how good control is. Surgeons can decide the risk is unacceptable.Do you have good control of your BS as if the consultant thinks it is too high they might not think the risk would be worth it.