Item 7.01 Regulation FD Disclosure.
On January 13, 2009, Biogen Idec Inc. ("Biogen Idec") is presenting at J.P. Morgan's 27th Annual Healthcare Conference in San Francisco. A copy of Biogen Idec's slide presentation for the conference is attached hereto as Exhibit 99.1 and is incorporated herein by reference.
The slide presentation is being furnished with this Current Report on Form 8-K and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934 (the "Exchange Act") or otherwise subject to the liabilities of that Section, nor shall such document be deemed incorporated by reference in any filing under the Securities Act of 1933 or the Exchange Act. Item 9.01 Financial Statements and Exhibits.
The exhibits listed on the Exhibit Index immediately preceding such exhibits are furnished as part of this Current Report on Form 8-K.

---

Table of Contents