格隆汇2月21日｜联合健康(UNH.US)盘初一度大跌近13%，至438.5美元。此前据华尔街日报称，美国司法部开始调查联合健康的医疗保险计费行为。不过，联合健康称华尔街日报的报道是错误信息。(格隆汇)

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