UnitedHealth Group (UNH)

6.000% Notes due February 15, 2018

3

[REVERSE SIDE OF NOTE]

This Note is one of a duly authorized issue of securities of the Company (herein called the “Notes”) issued and to be issued in one or more series under an indenture, dated as of February 4, 2008, between the Company and U.S. Bank National Association, as trustee (the “Trustee,” which term includes any successor trustee), as further supplemented by an Officers’ Certificate and Company Order dated February 7, 2008 pursuant to Section 301 of the indenture (together, the “Indenture”) between the Company and the Trustee, to which Indenture and all indentures supplemental thereto reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Notes, and the terms upon which the Notes are, and are to be, authenticated and delivered. This Note is one of the series designated on the face hereof, limited in initial aggregate principal amount to $1,100,000,000; provided, however, that the Company may, so long as no Event of Default has occurred and is continuing, without the consent of the Holders of the Notes of this series, issue additional notes with the same terms as the Notes of this series, and such additional notes shall be considered part of the same series under the Indenture as the Notes of this series.