Does the doctor even know how minimal the fees are, compared to the loss in revenue from patients switching to a doctor who does take credit cards? For example, if we collect $3000 in CC charges in our office, the fees are approximately $150 for the month. That is NOTHING compared to what would happen in terms of revenue loss if we told just one patient we don't take CC's, and they go elsewhere. Even if the fees were twice that a month or more, we still would lose out by not taking CC's and having patients leave.
My guess is the doctor doesn't have a clear idea of what the fees are, and definitely needs to be educated on it. With more and more patients having HSA/Flex spending cards, to not accept CC's is not good business, IMHO. I know I wouldn't go to an office that didn't take credit/debit cards, and that is simply because I do not carry cash or checks with me normally. People also want to build up cash back rewards, so will whip out their card even if they do have cash or a check on them. I see it all the time in my office.
Maybe you could get quotes from various CC processing companies, and present that to the doctor. Start with the CC company associated with the bank the practice uses, and go from there. I truly think that if the doctor sees how minimal the fees are compared to loss of revenue, he will realize he is being penny-wise and pound foolish.