This paper studies the efficiency effects of physician fees when the i
nsurer (possibly the government) pays a fee for each procedure, and th
e doctor may supplement the fee by an extra charge to the patient, a p
ractice known as 'balance billing.' Monopolistically competitive physi
cians can discriminate among patients on the basis of both price and q
uality. Equilibria with and without balance billing are compared. The
paper analyzes and recommends a new fee policy, a form of payer 'fee d
iscrimination.'