When I need a prescription refilled I request a refill from the pharmacy. If the prescription has expired the pharmacy calls or faxes my doctor's office and they send a new prescription to the pharmacy. There is no charge for this.

I've only ever had doctors that worked that way so didn't even know that there were some that did not.

I now wonder which is more common, and if there is some way to tell beforehand when choosing a new doctor which kind they are?