Doctor follow-ups

I went to see my doctor again today, it was another follow-up and I was surprised when he told me that the next visit onwards he would not charge me anymore. I was pleasantly surprised but thought that it is actually very fair, otherwise what is there to keep the doctor from giving continuous follow-ups even after the patient is well already. But then it occurred to me that he had already charged me a bomb already so far so it's not exactly a big loss for him to give me a few extra free visits..Nevertheless it's better than nothing and at least now I can go for the appointments without the apprehension of another whopping bill.