Yes, in the DSM 5, it is mentioned as a diagnosable disorder. There is even a brief paragraph about it in my Abnormal Psych book. I would guess that if you are posting here, it must cause some distress and/or interference in your life.

I do, also, want to add that my restrictive eating, also, began as selective eating. Even as a kid I would refuse foods because they made me anxious. It might be worth discussing it with someone if you're worried about it.