UNITED STATES SECURITIES AND
    EXCHANGE COMMISSIONWashington, D.C.
    20549
 Form 10-K/A
  Amendment No. 1
  þ

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
    SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended
    December 31,
    2010ORo

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
    SECURITIES EXCHANGE ACT OF 1934For the transition period
    from          to   Commission File Number
    001-31574
 AMERIGROUP
    Corporation
 (Exact name of registrant as
    specified in its charter)
  Delaware(State or Other Jurisdiction
    of
    Incorporation or Organization)

54-1739323(I.R.S. Employer
    Identification No.)4425 Corporation Lane,
    Virginia Beach, Virginia(Address of principal
    executive offices)

23462(Zip
    Code)     Registrants telephone number, including area code:
 (757) 490-6900
  Securities registered pursuant to Section 12(b) of the
    Act:
  Title of Each Class

Name of Each Exchange on Which RegisteredCommon Stock, $.01 par value

New York Stock Exchange   þ o
  o þ
  þ o
  Regulation S-T þ o
  Regulation S-K Form 10-K 10-K. o
  Rule 12b-2
  Large
    accelerated
    filer þ
    Accelerated
    filer o
    Non-accelerated
    filer o
    Smaller
    reporting
    company o   Rule 12b-2 o þ
      Class

Outstanding at February 17, 2011Common Stock, $.01 par value

49,498,758   Documents
    Incorporated by Reference
  Document

Parts Into Which IncorporatedProxy Statement for the Annual Meeting of Stockholders to be
    held 
    May 12, 2011 (Proxy Statement)

Part III




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EXPLANATORY NOTE
    Item 15. Exhibits and Financial Statement Schedules
 Exhibits.
  ExhibitNumber
    
    Description*10.19.4
    
    Amendment No. 9 between Georgia Department of
Community Health and AMGP Georgia Managed Care
Company, Inc. for the provision of HMO services
to Georgia Families for the period from July 1,
2010 through June 30, 2011, filed herewith.10.20.6
    
    Amendment effective December 1, 2010, to the
Health & Human Services Commission Agreement for
Health Services to the STAR, STAR+PLUS, CHIP,
and CHIP Perinatal programs in the Bexar,
Dallas, Harris, Nueces, Tarrant, and Travis
Service Delivery Areas expiring August 31, 2013,
filed herewith.10.20.7
    
    Amendment effective March 1, 2011, to the Health
& Human Services Commission Agreement for Health
Services to the STAR, STAR+PLUS, CHIP, and CHIP
Perinatal programs in the Bexar, Dallas, Harris,
Nueces, Tarrant, and Travis Service Delivery
Areas expiring August 31, 2013, filed herewith.31.1
    
    Certification of Chief Executive Officer
pursuant to Section 302 of Sarbanes-Oxley Act of
2002, dated May 13, 2011.31.2
    
    Certification of Chief Financial Officer
pursuant to Section 302 of Sarbanes-Oxley Act of
2002, dated May 13, 2011.
 
 *
    
    The Company has requested confidential treatment of
the redacted portions of this exhibit pursuant to Rule
24b-2, under the Securities Exchange Act of 1934, as
amended, and has separately filed a complete copy of this
exhibit with the Securities and Exchange Commission. 2




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Signatures
    Corporation
  By:
    /s/  James
    W. Truess   Title:
    Chief Financial Officer and     Signatures

Title

Date/s/  James
    G. CarlsonJames
    G. Carlson

Chairman, Chief Executive 
    Officer and President

May 13, 2011/s/  James
    W. TruessJames
    W. Truess

Chief Financial Officer and 
    Executive Vice President

May 13, 2011/s/  Margaret
    M. RoomsburgMargaret
    M. Roomsburg

Chief Accounting Officer and 
    Senior Vice President

May 13, 2011/s/  Thomas
    E. CappsThomas
    E. Capps

Director

May 13, 2011/s/  Jeffrey
    B. ChildJeffrey
    B. Child

Director

May 13, 2011/s/  Emerson
    U. FullwoodEmerson
    U. Fullwood

Director

May 13, 2011/s/  Kay
    Coles JamesKay
    Coles James

Director

May 13, 2011/s/  William
    J. McBrideWilliam
    J. McBride

Director

May 13, 2011/s/  Hala
    ModdelmogHala
    Moddelmog

Director

May 13, 2011/s/  Joseph
    W. PrueherJoseph
    W. Prueher

Director

May 13, 2011 3




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Signatures

Title

Date/s/  Uwe
    E. Reinhardt, Ph.D.Uwe
    E. Reinhardt, Ph.D.

Director

May 13, 2011/s/  Richard
    D. ShirkRichard
    D. Shirk

Director

May 13, 2011/s/  John
    W. SnowJohn
    W. Snow

Director

May 13, 2011  4