Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

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

• Form S-8 No. 333-84906 and Form S-8 No. 333-129334 pertaining to the Anthem 401(k) Plan;

• Form S-8 No. 333-159830 pertaining to the Anthem Incentive Compensation Plan;

• Form S-8 No. 333-156099 pertaining to the Anthem, Inc. Employee Stock Purchase Plan;

• Post-Effective Amendment No. 1 to Form S-3 No. 333-200749 pertaining to the Anthem, Inc. registration of senior debt securities, subordinated debt securities, preferred stock, common stock, depositary shares, warrants, rights, stock purchase contracts and stock purchase units; and

• Form S-4 No. 333-207218 pertaining to the Anthem, Inc. registration of shares of common stock and the joint Proxy Statement of Anthem, Inc. and Cigna Corporation

of our report dated February 22, 2017, with respect to the consolidated financial statements and schedule of Anthem, Inc., and the effectiveness of internal control over financial reporting of Anthem, Inc., included in its Annual Report (Form 10-K) for the year ended December 31, 2016.

/S/ ERNST & YOUNG LLP

Indianapolis, Indiana

February 22, 2017