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Young adults insured under their parents' plans were shielded from the potentially catastrophic cost of a medical emergency, a review of hospital records found. Researchers say $147 million in hospital bills were charged to insurers rather than the patients in 2011.

Immigrants contribute tens of billions of dollars a year more to Medicare than immigrant retirees use in medical services, an analysis finds. Restrictions on immigration could deplete Medicare's finances.

The long battle for federal approval of Plan B emergency contraception appears to be over. But broader access to the medicine may not reduce the number of unintended pregnancies by much.

Among those who stand to benefit the most from the expansion of Medicaid are homeless adults. Many of these men and women are mentally ill or addicted to drugs and alcohol. Enrolling them can be difficult, but the benefits should be substantial.

In the past, many psychotherapists ran their own little businesses. But changes in health care coverage mean that many must start accepting insurance and doing paperwork. That's leading some therapists to form group practices or join large medical groups — and may lead to better care for patients.

Insurance enrollment will be a key yardstick for assessing whether the Affordable Care Act is working. Almost as important as the total number of people who get coverage is whether a significant percentage of them are healthy.

Many health insurance policies for part-time workers will end next year and won't be renewed. Better quality choices will likely be on the menu for these workers, though they are also going to cost people more.

The medical screening tests offered by churches and other nonprofits may sound like a great idea. But some of the tests, which are performed by for-profit companies, are not recommended by national organizations because they can lead to invasive testing and unnecessary treatment.

For the system to work, however, age won't be as important as how healthy or unhealthy all the new enrollees are. And insurers won't really know that until next year, when claims start rolling in. Sick people are more motivated to sign up early, researchers say.

No one knows for sure right now how many of the estimated 14 million people who buy their own coverage are getting cancellation notices, but the numbers appear to be big. Some insurers report discontinuing 20 percent of their individual business, while other insurers have notified up to 80 percent of policyholders that they will have to change plans.