UnitedHealth Group (NYSE:UNH) is the nation's largest insurer and the company just put up solid second-quarter results that may suggest good news is coming from competitors, including WellPoint (NYSE: WLP).

The second quarter was particularly important to the industry given it marked the first full quarter following the close of Obamacare's first open enrollment period. 

UNH Chart

UNH data by YCharts.

In the following slideshow, I highlight three important quotes from UnitedHealth's CEO that offer insight into the affects of health care exchanges and Medicaid expansion.

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Todd Campbell has no position in any stocks mentioned. Todd owns E.B. Capital Markets, LLC. E.B. Capital's clients may or may not have positions in the companies mentioned. Todd owns Gundalow Advisors, LLC. Gundalow's clients do not have positions in the companies mentioned. The Motley Fool recommends UnitedHealth Group and WellPoint. The Motley Fool owns shares of WellPoint. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.