U.S. health insurers are submitting their 2016 rate requests for Affordable Care Act policies, with some asking for big increases as they adjust to customers whove recently gained coverage through the marketplaces.

A small group of doctors accounted for a large chunk of Medicare payments once again, data released today by the U.S. government show.

If Humana sells itself, this could be the biggest acquisition of a U.S. managed-care provider in more than a decade. Shares of other health insurers, including Anthem, Cigna, and Molina Healthcare also jumped to record prices.

In the first major overhaul in more than a decade, the United States has proposed new rules for private health insurers who run Medicaid plans covering millions of poor people and children.

An Obamacare experiment to lower health care costs may expand after recording more than $384 million in savings in its first two years.

There may be just $1 in the piggy bank to cover every $10 in claims at an Obamacare program designed to spread risk among insurers, Standard & Poors said.

Aetna Inc. shares rose to a record after the company added 1 million people to its health-insurance rolls, lifting first-quarter earnings and prompting it to boost its annual forecast.

Marilyn Tavenner, who resigned as head of the Centers for Medicare and Medicaid Services earlier this year, is returning to the hospital industry.