Hello and thank you for your question. The only time "consent" from a doctor, other than the one performing the surgery, is needed is if the doctor performing the surgery is concerned about whether your body/health will be able to handle the surgery being performed. This is called a medical clearance. In that case, your medical doctor may advise that surgery is not safe, and your operating doctor may agree. However, you do not need to ask your medical doctor for "approval" especially if no medical clearance is necessary. I hope this helps!
Ankur Mehta MD