Aetna Inc., the third-biggest U.S. insurer, reported earnings that missed analyst estimates as Medicare costs were higher than expected.

Humana Inc. said it has received 202,000 applications for health insurance through the Obamacare exchanges.

One in four U.S. families struggled to pay medical bills in 2012, and 1 in 10 said they had costs they couldnt pay at all, according to a government survey.

The percentage of adults without health insurance fell this month to the lowest level since the end of 2012 as the core provisions of Obamacare took effect, a Gallup poll found.