EX-23 4 a2202008zex-23.htm EX-23
QuickLinks -- Click here to rapidly navigate through this document


Exhibit 23

Consent of Independent Registered Public Accounting Firm

        We consent to the incorporation by reference in the following Registration Statements of Magellan Health Services, Inc.:

Form
  Registration Number   Date Filed  

S-8

     333-151509     5/20/2008  

S-8

     333-141056     3/05/2007  

S-8

     333-134202     5/17/2006  

S-8

     333-134201     5/17/2006  

S-8

     333-134199     5/17/2006  

S-8

     333-123222     3/09/2005  

of our reports dated February 25, 2011, with respect to the consolidated financial statements and schedule of Magellan Health Services, Inc., and the effectiveness of internal control over financial reporting of Magellan Health Services, Inc., included in this Annual Report (Form 10-K) of Magellan Health Services, Inc. for the year ended December 31, 2010.

Baltimore, Maryland
February 25, 2011



QuickLinks