If the site is specific to one profession, it belongs in the category for that profession, (in the education or continuing education subcategory if that exists).
For example, sites primarily about continuing education for nurses belong in Health/Nursing/Education/Continuing_Education, those for physicians in Health/Medicine/Education/Continuing_Medical_Education, etc.
If the site is relevant for a single profession, please use the Education subcategory for that profession.
Sites with more general content, where CME is just one of several aspects covered, do not belong here and should be listed in a more general category such as one of the subcategories of Business/Healthcare/Products_and_Services