RIVERSIDE, calif.In the Inland Empire, an economically depressed region in Southern California, President Barack Obama's health care law is expected to extend insurance coverage to more than 300,000 people by 2014. But coverage will not necessarily translate into care: Local health experts doubt there will be enough doctors to meet the area's needs.

Other places across the country, including the Mississippi Delta, Detroit and suburban Phoenix, face similar problems. The Association of American Medical Colleges estimates that in 2015, the country will have 62,900 fewer doctors than needed. That number will more than double by 2025, as the expansion of insurance coverage and the aging of baby boomers drive up demand

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Health experts say there is little that the government or the medical profession will be able to do to close the gap by 2014, when the law begins extending coverage to about 30 million Americans. It typically takes a decade to train a doctor.

"We have a shortage of every kind of doctor, except for plastic surgeons and dermatologists," said Dr. G. Richard Olds, dean of the new medical school at the University of California, Riverside, founded in part to address the region's doctor shortage. "We'll have a 5,000-physician shortage in 10 years, no matter what anybody does."

Experts describe a doctor shortage as an "invisible problem." Patients still get care, but the process is often slow and difficult. In Riverside, it has left residents driving long distances to doctors, languishing on waiting lists, overusing emergency rooms and forgoing care.

"It results in delayed care and higher levels of acuity," said Dustin Corcoran, the chief executive of the California Medical Association, which represents 35,000 physicians.

People "access the health care system through the emergency department, rather than establishing a relationship with a primary care physician who might keep them from getting sicker," Corcoran said.

In the Inland Empire, encompassing the counties of Riverside and San Bernardino, the shortage of doctors is already severe. The population of Riverside County swelled 42 percent in the 2000s, gaining more than 644,000 people. But the growth in the number of physicians has lagged, in no small part because the area has trouble attracting doctors, who might make more money and prefer living in nearby Orange County or Los Angeles.

Moreover, across the country, fewer than half of primary care clinicians were accepting new Medicaid patients as of 2008, making it hard for the poor to find care even when they are eligible for Medicaid. The expansion of Medicaid accounts for more than one-third of the overall growth in coverage in Obama's health care law.

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Doctor shortage to strain system after health-care law hikes demand