It's no secret Jeff Bezos has been looking to crack health care. But no one expected him to pull in Warren Buffett and Jamie Dimon, too.

News Tuesday that Bezos's Amazon.com Inc., Buffett's Berkshire Hathaway Inc. and JPMorgan Chase & Co., led by Dimon, plan to join forces to change how health care is provided to their combined 1 million U.S. employees sent shock waves through the health care industry.

The plan, while in early stages and focused solely on the three giants' staff for now, seems almost certain to set its sights on disrupting the broader industry. It's the first big move by Amazon in the sector after months of speculation that the internet behemoth might make an entry. The Amazon-Berkshire-JPMorgan collaboration will likely pressure profits for middlemen in the health care supply chain.