Many doctors are disturbed they will be paid less -- often a lot less -- to care for the millions of patients projected to buy coverage through the health law's new insurance marketplaces. Some have complained to medical associations, including those in New York, California, Connecticut, Texas and Georgia, saying the discounted rates could lead to a two-tiered system in which fewer doctors participate, potentially making it harder for consumers to get the care they need. "As it is, there is a shortage of primary care physicians in the country, and they don't have enough time to see all the patients who are calling them," said Peter Cunningham, a senior fellow at the nonpartisan Center for Studying Health System Change in Washington D.C.