A coalition of 31 HIV/AIDS organizations is urging the Obama administration to investigate whether some health insurers are trying to discourage HIV-infected patients from enrolling in new policies being sold under the health-care law, a move the groups say could be illegal. The Affordable Care Act prohibits discrimination against people who are sick; insurers can't deny them coverage or charge them more than healthier peers. But in a letter to Secretary of Health and Human Services Kathleen Sebelius last week, the coalition said it had noticed "a number of disturbing trends" in plans on the insurance exchanges, including plans that...