EXHIBIT 1

JOINT FILING AGREEMENT

The undersigned hereby agree that the Statement on Schedule 13G filed on or about the date set forth below, and any amendments thereto, with respect to the beneficial ownership by the undersigned of shares of the common stock, par value $.0001 per share, of Emdeon Corporation, a Delaware corporation, is being filed on behalf of the undersigned in accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.

The undersigned further agree that each party hereto is responsible for timely filing of such Statement on Schedule 13G, and any amendments thereto, and for the completeness and accuracy of the information concerning such party contained therein, provided that no party is responsible for the completeness and accuracy of the information concerning any other party, unless such party knows or has reason to believe that such information is inaccurate. The undersigned further agree that this agreement will be included as an exhibit to such joint filing.

This agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

In witness whereof, the undersigned have caused this agreement to be executed on their behalf this 22nd day of March, 2007.

CalPERS/PCG Corporate Partners, LLC
By:	PCG Corporate Partners Investments LLC, its Manager
	By:	Pacific Corporate Group Holdings, LLC, its Managing Member
By:	/s/ Timothy Kelleher
	Timothy Kelleher
	Managing Director
PCG Corporate Partners Investments LLC
By:	Pacific Corporate Group Holdings, LLC, its Managing Member
By:	/s/ Timothy Kelleher
	Timothy Kelleher
	Managing Director
Pacific Corporate Group Holdings, LLC
By:	/s/ Timothy Kelleher
	Timothy Kelleher
	Managing Director