Federally funded programs will add at least 2,300 new primary care practitioners by the end of 2015, but the funding for at least one of those programs is set to expire at the same time, contributing to a massive shortage of doctors available to treat patients — including those newly insured through the Affordable Care Act and Medicare.

The U.S. is expected to need 52,000 more primary care physicians by 2025, according to a study by the Robert Graham Center, which does family medicine policy research. But funding for teaching hospitals that could train thousands more of these doctors expires in late 2015.

Population growth will drive most of the need for family care doctors, accounting for 33,000 additional physicians, the study says. The aging population will require about 10,000 more. The Affordable Care Act is expected to increase the number of family doctors needed by more than 8,000, the study says.

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