Washington, May 13 (AP) UnitedHealth CEO Andrew Witty is stepping down for personal reasons and the nation's largest health insurer suspended its full-year financial outlook due to higher-than-expected medical costs.

UnitedHealth said Tuesday that Chairman Stephen Hemsley will become CEO, effective immediately.

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Hemsley was UnitedHealth Group CEO from 2006 to 2017. He will remain chairman of the company's board. Witty will serve as a senior adviser to Hemsley.

UnitedHealth said that it suspended its 2025 outlook as medical costs of many Medicare Advantage beneficiaries new to UnitedHealthcare were higher than expected.

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UnitedHealth anticipates returning to growth next year. (AP)

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