How long does the Post Office Forward Mail?
If you are in the UK, and you’ve set up the Redirection (Forwarding Service) it will last as long as you paid for. They will forward all items with the stated names on it, but nothing else. I’m guessing this is fairly similar in all countries. Its quite possible that your bills missed the redirection and got delivered to the original place by mistake – this can happen, we’re only human – and you may just have to get in touch with them, or give it a few days. They may have put it back in the mail which means it’ll either get returned to the doctor as “untraceable” or sent on to you, if they catch it in the redirect. I don’t think you have too much to worry about, if you’re doctor is good, he’ll understand.