Exhibit 99.1

MAGELLAN HEALTH SERVICES REPORTS

FOURTH QUARTER AND FULL YEAR 2011 FINANCIAL RESULTS

AVON, Conn. — February 28, 2012 — Magellan Health Services Inc. (NASDAQ: MGLN) today reported financial results for the fourth quarter and full year 2011, as summarized below. For the year ended December 31, 2011, the company reported net revenue of $2,799.4 million, segment profit of $270.4 million, and net income of $129.6 million or $4.17 per diluted common share. Segment profit represents income from operations before stock compensation expense, depreciation and amortization, interest expense, interest income, gain on sale of assets, special charges or benefits, and income taxes.

Financial Results

As of December 31, 2011, the company had unrestricted cash and investments of $183.2 million.

“Magellan had a strong fourth quarter, which completed a successful 2011,” said René Lerer, M.D., chairman and chief executive officer. “In addition to achieving solid financial results, our accomplishments during the year included attracting new customers, retaining existing customers and implementing a focused growth strategy in Medicaid and Pharmacy. Contributing to Magellan’s success was strong performance in our Radiology Benefits Management and Medicaid Administration business segments. Additionally, our Public Sector and Commercial behavioral health segments had important customer wins that are being implemented in the first quarter of 2012.

“We are moving aggressively in our two leading strategic initiatives — expanding more broadly into the Medicaid market and providing comprehensive management of the total drug spend. These are essential components of our growth strategy, and have been and will continue to be a focus for investment. We have significant capabilities and experience in serving the Medicaid population and managing pharmaceutical costs, and we will continue to invest to grow those capabilities to meet the needs of customers and ensure our success.”

“There is a significant level of activity across our business lines to achieve growth, retention and profitability objectives, while maintaining our track record of product innovation,” said Karen S. Rohan, Magellan’s president. “We successfully implemented new contracts with Blue Shield of California and the Central Region of New York State on January 1, and will go live with the state of Louisiana on March 1. These contracts expand our presence in the marketplace by serving millions of new members.

Magellan Health Services—55 Nod Road, Avon CT 06001—www.MagellanHealth.com

“Throughout 2012, we will intensify our effort to renew key accounts and accelerate initiatives to improve business outcomes. We have already taken decisive steps to position Magellan to be successful for the rebid of the Maricopa County, Ariz., account. Our recently announced joint venture with Phoenix Health Plan is a clear demonstration of our ability to adapt and innovate in a changing marketplace where customers are seeking new solutions. Additionally, driving operational excellence remains a priority, and we are executing targeted initiatives to address cost pressures in our Commercial behavioral health segment.”

Outlook

“Overall we completed a strong 2011, exceeding our segment profit guidance for the year,” said Jonathan N. Rubin, chief financial officer. “In addition to delivering good results, we returned significant capital to shareholders through our share repurchase program. Magellan’s strong cash flow and the availability of a previously announced credit facility give us the financial flexibility to support our strategy for growth.

“We are reaffirming our guidance for 2012, which calls for net revenue in the range of $3.2 billion to $3.4 billion, and net income in the range of $91 million to $109 million, which translates into diluted earnings per share in the range of $3.25 to $3.89. Additionally, we expect segment profit for 2012 to be in the range of $240 million to $260 million.”

Earnings Results Conference Call

Management will host a conference call at 10:00 a.m. Eastern Time on Tuesday, February 28, 2012. To participate in the conference call, interested parties should call 1-888-566-8408 and reference the pass code Fourth Quarter Earnings Call 2011 approximately 15 minutes before the start of the call. The conference call will also be available via a live Webcast at Magellan’s investor relations page at www.MagellanHealth.com.

About Magellan Health Services:  Headquartered in Avon, Conn., Magellan Health Services Inc. is a leading specialty health care management organization with expertise in managing behavioral health, radiology and specialty pharmaceuticals, as well as public sector pharmacy benefits programs. Magellan delivers innovative solutions to improve quality outcomes and optimize the cost of care for those we serve. Magellan’s customers include health plans, employers and government agencies, serving approximately 31.1 million members in our behavioral health business, 15.6 million members in our radiology benefits management segment, and 6 million members in our medical pharmacy management product. In addition, the specialty pharmaceutical segment serves 41 health plans and several pharmaceutical manufacturers and state Medicaid programs. The company’s Medicaid Administration segment serves 25 states and the District of Columbia.  For more information, visit www.MagellanHealth.com.

Cautionary Statement

This release contains forward-looking statements within the meaning of the Securities Exchange Act of 1934 and the Securities Act of 1933, as amended, which involve a number of risks and uncertainties.  All statements, other than statements of historical information provided herein, may be deemed to be forward-looking statements including, without limitation, statements regarding estimates of 2012 net revenue, net income, segment profit, earnings per share, and strategy. These statements are based on management’s analysis, judgment, belief and expectation only as of the date hereof, and are subject to uncertainty and changes in circumstances. Without limiting the foregoing, the words “believes,” “anticipates,” “plans,” “expects,” “may,” “should,” “could,” “estimate,” “intend” and other similar expressions are intended to identify forward-looking statements. Actual results could differ materially due to, among other things, the possible election of certain of the company’s customers to manage the health care services of their members directly; changes in rates paid to and/or by the company by customers and/or providers; higher utilization of health care services by the company’s risk

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members; delays, higher costs or inability to implement new business or other company initiatives; the impact of changes in the contracting model for Medicaid contracts; termination or non-renewal of customer contracts; the impact of new or amended laws or regulations; governmental inquiries; litigation; competition; operational issues; health care reform; and general business conditions. Additional factors that could cause actual results to differ materially from those reflected in the forward-looking statements include, but are not limited to, the risks discussed in the “Risk Factors” section included within the company’s Annual Report on Form 10-K for the year ended December 31, 2010, filed with the Securities and Exchange Commission on February 25, 2011, and the company’s subsequent Quarterly Reports on Form 10-Q filed during 2011 and the company’s Annual Report on Form 10-K for the year ended December 31, 2011, expected to be filed with the Securities and Exchange Commission and posted on the company’s website later today.  Readers are cautioned not to place undue reliance on these forward-looking statements. The company undertakes no obligation to publicly revise these forward-looking statements to reflect events or circumstances that arise after the date of this release. Segment profit information referred to herein may be considered a non-GAAP financial measure.  Further information regarding this measure, including the reasons management considers this information useful to investors, are included in the company’s most recent Annual Report on Form 10-K and on subsequent Form 10-Qs.

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MAGELLAN HEALTH SERVICES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

(In thousands, except per share amounts)

(1)         For a more detailed discussion of Magellan’s results for the year ended December 31, 2011, refer to the Company’s Annual Report on Form 10-K, which will be filed with the SEC on February 28, 2012, and the live broadcast or taped replay of the Company’s earnings conference call on Tuesday, February 28, 2012, which will be available at www.MagellanHealth.com.

(2)         Includes stock compensation expense of $3,272 and $4,010 for the three months ended December 31, 2010 and 2011, respectively, and $15,102 and $17,418 for the years ended December 31, 2010 and 2011, respectively.

MAGELLAN HEALTH SERVICES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(1)         The Company’s Annual Report on Form 10-K for the year ended December 31, 2011 will be filed with the SEC on February 28, 2012.

(2)         Includes the net shift of restricted funds between cash and investments that results in an operating cash flow change that is directly offset by an investing cash flow change.  During the year ended December 31, 2010, restricted cash of $36,701 was shifted to restricted investments that resulted in an operating cash flow source.  During the year ended December 31, 2011, restricted investments of $62,298 were shifted to restricted cash that resulted in an operating cash flow use.

MAGELLAN HEALTH SERVICES, INC. AND SUBSIDIARIES

CONSOLIDATED OPERATING RESULTS BY BUSINESS SEGMENT

(In thousands)

(1)         The Company’s Annual Report on Form 10-K for the year ended December 31, 2011 will be filed with the SEC on February 28, 2012.

(2)         Effective September 1, 2010, Public Sector has subcontracted with Medicaid Administration to provide pharmacy benefits management services on a limited risk basis for one of Public Sector’s customers.  As such, revenue and cost of care related to this intersegment arrangement are eliminated.

(3)         Stock compensation expense is included in direct service costs and other operating expenses; however, this amount is excluded from the computation of segment profit since it is managed on a consolidated basis.