Shares of HCA Holdings (HCA) - Get Report  closed lower by 2.36% to $85.65 on Monday, after the hospital operator previewed its 2017 first quarter financials, with results coming in below analysts' expectations.

HCA expects earnings of $1.74 per share, below the FactSet consensus of $1.79 per share. The company believes revenue will come in at $10.6 billion vs. analysts' forecast of $10.7 billion.

The company reaffirmed its 2017 full year guidance. HCA attributes its preliminary results to changes in payer mix, and a lower percentage of same facility managed care/health exchange admissions.

HCA will post its official results on or about May 2, 2017.

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This article has been updated from its original publish time of 11:43 a.m.