Managing Lists on WordPress

If you aren’t afraid to do a lot of development, you could play around with custom post types. Each doctor could be a custom post type.

In addition, we are able to create custom taxonomies in WordPress. In this case, you may create a custom taxonomy called Specialties.

I would only recommend this if you are familiar with plugin development and don’t mind also creating a couple new template pages for your new custom post types.

This is probably a little more advanced than what you are looking for though.