For a dividend-growth investor, the path to lasting success is as simple as buying and holding businesses that are consistently growing. After all, steadily rising profits drive dividend growth over long periods of time.

There aren't many businesses that have delivered dividend growth as incredibly as the health insurer UnitedHealth Group (NYSE: UNH). The company's quarterly dividend per share has grown by a staggering 1,404% since switching from an annual dividend to its first quarterly dividend in June 2010. 

Does UnitedHealth Group still belong in a dividend-growth stock portfolio? And if so, is the stock a buy at the current valuation? Let's dive in to get an answer.

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Source Fool.com