JPMorgan Chase Bank, N.A., as Administrative Agent under the Credit Agreement referred to below Loan and Agency Services Group

Exhibit 99.1

January 30, 2015

JPMorgan Chase Bank, N.A.,

as Administrative Agent under the Credit

Agreement referred to below

Loan and Agency Services Group

000 Xxxxxxx Xxxxxxxxxx Xxxx, Xxx 0

Xxxxxx, XX 00000-0000

Attention: Xxxxxxx Xxxxxxx, Xxxxxxxxx Xxxxxx

Maturity Date Extension Request

Reference is made to the Five-Year Credit Agreement dated as of March 27, 2012, as amended as of September 24, 2012 (as heretofore amended, extended or otherwise modified, the “Credit Agreement”), among Aetna Inc. (the “Company”), the lenders party thereto (the “Lenders”), the syndication and documentation agents party thereto and JPMorgan Chase Bank, N.A., as administrative agent. Terms used but not defined herein have the meanings assigned to them in the Credit Agreement.

Pursuant to Section 2.08(d) of the Credit Agreement, the Company hereby requests that the Lenders agree to extend the Maturity Date from March 27, 2019 to March 27, 2020 and extend the Commitments for an additional period of one year. This notice is being provided to the Administrative Agent in accordance with Section 2.08(d) of the Credit Agreement, and the Company understands that the Administrative Agent will notify each of the Lenders of this notice.

AETNA INC.,

By: /s/ Xxxxx Xxxx

Name: Xxxxx Xxxx

Title: Vice President, Finance

and Treasurer

Copies to:

JPMorgan Chase Bank, N.A.

000 Xxxxxxx Xxxxxx, 00xx Xxxxx

Xxx Xxxx, Xxx Xxxx 00000

Attention: Xxxxxxx Xxxx

XX Xxxxxx Xxxxx Bank, N.A.

00000 Xxxxxxxx Xxxxx Xxxxx

0xx Xxxxx

Xxxxx, XX 00000

Attention: Xxxxx Xxxxxx