Healthcare is an evergreen frontier for investing. An endless need for better treatments and cures demands innovation and growth, which isn't a bad place to find long-term winners you can stick in a diversified portfolio.

But while the broader market has had a pretty strong year thus far, it seems like the healthcare sector might be out of style now. That's great news for long-term investors looking for bargains. Here are three quality healthcare stocks you should consider buying this month.

UnitedHealth Group (NYSE: UNH) might be the most critical cog in America's healthcare machine. It's a sprawling enterprise that features two businesses, UnitedHealthcare and Optum. UnitedHealthcare is the company's insurance arm, and provides healthcare benefits to over 150 million people through various individual, employer, and government plans. Optum itself is a three-pronged segment that delivers care, Rx services, and data analytics to patients and professionals in healthcare.

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Source Fool.com