Doctor of Clinical Medicine (DCM) professional degreeDM or doctor of medicine is the superspeciality and the highest degree a physician has in the field of medicine with variety of subjects such as cardiology nephrology whereas MD is the speciality course for a postgraduate aspirant to choose the subject of medicine.MD=These initials refer to the doctor's credentials – they indicate the type of medicalschool the doctor attended and the licensing exam they took to become a doctor.MD stands for "Doctor of Medicine," and is the most common type of degree earned by doctors who practice medicine in the United States.MD-PhD Dual Degree Training. MD-PhD programs provide training in both medicine and research. They are specifically designed for those who want to become research physicians, also known as physician-investigators or physician-scientists.