Here are some medical website designs I found on ThemeForest.net that look great and they have lots of satisfied purchasers. They all run on WordPress which gives them 2 huge advantages.
1.) The content can easily be updated by medical office staff or Doctors themselves.
2.) Since they run on WordPress, they will rank well on Google with a minimum of extra SEO work.
ThemeForest.net WordPress sites (don’t forget to sort on sales) This will give you a list of choices