Company:  BIOGEN IDEC INC. (BIIB)
Form Type:  10-Q
Filing Date:  10/21/2009 
CIK:  0000875045 
Address:  14 CAMBRIDGE CENTER 
City, State, Zip:  CAMBRIDGE, Massachusetts 02142 
Telephone:  (617) 679-2000 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$46.38   		Change: 
0.53 (1.16%)  
Trade Time: 
Nov 20   		Market Cap: 
$13.41B
Description of Business
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  FORM 10-Q
    PART I FINANCIAL INFORMATION
      FINANCIAL STATEMENTS
        INCOME STATEMENT
        BALANCE SHEET
        CASH FLOW
        NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
          BALANCE SHEET
          INCOME STATEMENT
          INCOME STATEMENT
          INCOME STATEMENT
          INCOME STATEMENT
          INCOME STATEMENT
          INCOME STATEMENT
          INCOME STATEMENT
      Item 2. Management's Discussion and Analysis of Financial ...
        BENEFICIAL OWNERS
      Item 3. Quantitative and Qualitative Disclosures About ...
      Item 4. Controls and Procedures
    Part II - OTHER INFORMATION
      Item 1. Legal Proceedings
      Item 1A. Risk Factors
      Item 2. Unregistered Sales of Equity Securities and Use of ...
      Item 6. Exhibits
    SIGNATURES
    EXHIBIT INDEX
  EXHIBIT 31.1
    CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO
  EXHIBIT 31.2
    CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO
  EXHIBIT 32.1
    CERTIFICATION
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