Healthcare in the United States is big business: Experts believe the system could generate more than $6 trillion in annual spending by 2030. That's an opportunity for investors to find the key players that can help grow a portfolio.

But there are so many companies in the sector, including those in medical devices, pharmaceuticals, insurance, and more. How do you know where to look?

To get you started, I've done a little groundwork on this sector of the market. There are a lot of blue-chip healthcare stocks to choose from, but UnitedHealth Group (NYSE: UNH), AbbVie (NYSE: ABBV), and (NYSE: PFE) stand out among the crowd. The strong fundamentals and attractive prices of these three top stocks make them great October stocks you can buy and hold indefinitely.

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Source Fool.com