The insurer is purchasing the company from private equity firm New Mountain Capital, The Wall Street Journal reported, citing people familiar with the matter.
Equian provides payment-processing for insurers and health-care companies and seeks to reduce overpayments, according to the report.
Shares of UnitedHealth fell $2.43, or 0.97%, to close at $247.76, ahead of the report. The stock was little changed in after-hours trading.
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