Open enrollment for 2016 ends Sunday for those who buy health plans from the private market or health insurance exchanges. But if you don’t act by the deadline, are you completely out of luck?

The Internal Revenue Service is warning consumers about tax scams involving the Affordable Care Act and penalties imposed under the law on people who go without health insurance.

Undercutting rivals on price is an unusual and stealthily brilliant strategy from Merck. It will likely burnish the company's image at a time when politicians are aggressively attacking high drug prices. It could possibly reshape the way drugs are priced. And who doesn't like a good old-fashioned price war?

After the open enrollment period ends on Sunday for buying coverage on the health insurance marketplaces, people can generally sign up for or switch marketplace plans only if they have certain major life changes, such as losing their on-the-job coverage or getting married. Following insurance industry criticism, last week the federal government said it will scrutinize people’s applications for such “special enrollment periods” more closely, including one of the most commonly cited reasons — relocating to a new state.

California voters will weigh in this November on a high-stakes ballot proposition intended to help control the cost of prescription drugs -- the latest attempt to limit soaring prices that have prompted public criticism nationwide.

The head of the third-biggest U.S. health insurer said he has “serious concerns” about whether or not Obamacare’s new markets are sustainable, echoing criticism from other top for-profit insurers.