Here’s a quick overview of the steps you’ll need to take to do this.
1. Log into Facebook
2. Click on your business fan page from the “PAGES” section on the left side.
3. Click on “Edit Page” at the top right hand corner of your Fan Page
4. You should be under the “Manage Permissions” tab on the left side of the page. Uncheck all the “Posting Ability” options.
5. Click the Save Changes button.
This is specifically for Fan Page privacy settings which limits what users who see the page can do on your Fan Page.
That should take care of it.
Remember, this does not apply to your personal Wall where more traditional Facebook stuff is done by most people – this is just for Fan Pages set up for your practice.
Even though the settings don’t say anything about “blocking comments”, unchecking the boxes as mentioned above should prevent anyone from “posting content on your Wall”, which is the same thing as commenting.
You can just ask a friend who’s on Facebook to try to post a comment in reply to a test post and see if they can do it.