Zocdoc, which is backed by investors including Jeff Bezos and has been valued at $2 billion, delayed the rollout last year, but is now going ahead with it. Chien told CNBC in August that his costs would go up seven-fold. Peter Chien, a dermatologist in New York, said he will have to pay $35 for a new patient and $80 if the person is seeing a procedural dermatology specialist. They say the pricing change will be unsustainable for their practices because it's too hard to recoup the costs for every new patient, seeing as most don't make regular visits. But the move has faced fierce resistance from physicians in the New York area who expressed their concerns to CNBC last year, when the company was piloting the new model.

Zocdoc said the purpose of the change is to accelerate the company's move into less-populated areas, where doctors can't see enough new patients to justify the flat fee. Personal Loans for 670 Credit Score or Lower Personal Loans for 580 Credit Score or Lower Best Debt Consolidation Loans for Bad Credit