He is head of the diagnostics department (which consists of him and his team). And – as he says in the pilot – they are looking for zebras [1], not horses. By the time patients get to him all the horses have already been ruled out.

I don’t know whether something like that exists in reality. That would be interesting to know. It at least sounds plausible.

[1] http://en.wikipedia.org/wiki/Zebra_(medicine)