HCA Healthcare (HCA) 10-K 2015 FY Annual report

Exhibit 23

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:

(1) Registration Statement (Form S-8 No. 333-197656) pertaining to the HCA Holdings, Inc. Employee Stock Purchase Plan,

(2) Registration Statement (Form S-8 No. 333-173866) pertaining to the HCA-Hospital Corporation of America Nonqualified Initial Option Plan, HCA Inc. 2000 Equity Incentive Plan and HCA 2005 Equity Incentive Plan,

(3) Registration Statement (Form S-8 No. 333-172887) pertaining to the 2006 Stock Incentive Plan for Key Employees of HCA Holdings, Inc. and its Affiliates, as Amended and Restated,

(4) Registration Statement (Form S-8 No. 333-150714) pertaining to the 2006 Stock Incentive Plan for Key Employees of HCA Inc. and its Affiliates, and

(5) Registration Statement (Form S-3 No. 333-201463) of HCA Holdings, Inc.;

of our reports dated February 26, 2016, with respect to the consolidated financial statements of HCA Holdings, Inc. and the effectiveness of internal control over financial reporting of HCA Holdings, Inc., included in this Annual Report (Form 10-K) of HCA Holdings, Inc. for the year ended December 31, 2015.

/s/ Ernst & Young LLP

Nashville, Tennessee

February 26, 2016