Thank you for your question:

Any list of "the best" will be in many ways very subjective. Each year, US News & World Report publishes a list of the "best" hospitals, including a specialty category.

For Diabetes & Endocrinology (the broader category under which diabetes falls) the most recent list included:
1 - Mayo Clinic
2 - Massachusetts General
3 - Johns Hopkins
4 - UCSF Medical Center
5 - Cleveland Clinic
6 - NY Presbyterian University Hospital of Columbia and Cornell
7 - Ronald Reagan UCLA Medical Center
8 - Yale-New Haven
9 - Brigham and Women's Hospital
10-University of Washington Medical Center

Here is a link to the full ranking
http://health.usnews.com/best-hospitals/rankings/diabetes-and-endocrinology

One of the reasons why these centers are some of the best is the fact that they tend to utilize a TEAM approach to treating medical conditions. Typically more than one specialist is involved in the care of a patient. Depending on the problems associated with a particular case, different specialist may be involved.

The same magazine provides a list of top endocrinologists (842) of which 178 were named "highly selective". Here is a link to that list.
http://health.usnews.com/top-doctors/directory/best-endocrinologists

I would suggest using these 2 lists to find a specialist near you affiliated with one of the top 10 or 15 centers in the USA.

Many experts consider Joslin Diabetes Center to be one of the best overall centers of excellence in the world
http://www.joslin.org/

FamilyPhysician41076.551009294