WASHINGTON Signing up for health insurance on the new state and federal exchanges was supposed to be the easy part of the Affordable Care Act. But the really dicey part, according to many health policy experts, is just beginning.

With the law fully in effect as of Jan. 1, they fear Americans who have enrolled in health insurance for the first time under the ACA are likely to discover that having coverage doesnt guarantee them easy access to a primary care doctor, dentist or mental health professional.

Some changes in the works, such as the use of new technologies and allowing mid-level medical providers to perform some functions usually reserved for doctors and dentists, should improve health care access in the long run. In the meantime, said Linda Rosenberg, president of the National Council for Behavioral Health, people are going to suffer.

According to the Health Resources and Services Administration, the federal agency charged with improving access to health care, nearly 20 percent of Americans live in areas with an insufficient number of primary care doctors. Sixteen percent live in areas with too few dentists, and a whopping 30 percent are in areas that are short of mental health providers. Under federal guidelines, there should be no more than 3,500 people for each primary care provider; no more than 5,000 people for each dental provider; and no more than 30,000 people for each mental health provider.

According to the Association of American Medical Colleges, unless something changes rapidly, there will be a shortage of 45,000 primary care doctors in the United States (as well as a shortfall of 46,000 specialists) by 2020.

In some ways, the shortage of providers is worse than the numbers indicate.

Many primary care doctors and dentists do not accept Medicaid patients because of low reimbursement rates, and many of the newly insured will be covered through Medicaid. Many psychiatrists refuse to accept insurance at all.

Christiane Mitchell, director of federal affairs for the Association of American Medical Colleges, predicted that many of the estimated 36 million Americans expected to gain coverage under the Affordable Care Act will endure long waits to see medical providers in their communities or have to travel far from home for appointments elsewhere.

During the debate over the Affordable Care Act, Mitchell said the association pushed for the federal government to fund additional slots for the training of doctors, but that provision was trimmed to keep the health care law from costing more than $1 trillion over 10 years.

There are various reasons for the shortages. Certainly a big contributor is the aging of the baby boomers, who may still love rock n roll but increasingly need hearing aids to enjoy it.

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Health care law may suffer from shortage of doctors