I think the original asker said he had never uploaded his contacts. Presumably though Facebook could just follow the reverse relation from the doctor without needing to confirm that it goes both ways.
Thanks for reading my post and noting this. I'm not sure the reverse relation applies either as it would require the doctor to have my personal contact on her mobile which is absolutely not the case as this is a shared practice and I haven't been to her in years.
the asker doesn't have to upload his contacts, he just has to tell facebook his number or email address. the doctor might have uploaded his contacts which include one of those pieces of information.