CUSIP No. 404119109

EXHIBIT 1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) of the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a Statement on Schedule 13G (including any and all amendments thereto) with respect to the common stock of HCA Inc. and further agree that this Joint Filing Agreement shall be included as an Exhibit to such joint filing.  In evidence thereof, the undersigned, being duly authorized, hereby execute this Joint Filing Agreement as of March 23, 2009.

	KKR MILLENNIUM FUND L.P.
By:	KKR Associates Millennium L.P., general partner
By:	KKR Millennium GP LLC, general partner
By:	/s/ William Janetschek
	Name: William Janetschek Title: Attorney-in-fact for Henry R. Kravis, Managing Member
	KKR ASSOCIATES MILLENNIUM L.P.
By:	KKR Millennium GP LLC, general partner
By:	/s/ William Janetschek
	Name: William Janetschek Title: Attorney-in-fact for Henry R. Kravis, Managing Member
	KKR MILLENNIUM GP LLC
By:	/s/ William Janetschek
	Name: William Janetschek Title: Attorney-in-fact for Henry R. Kravis, Managing Member

CUSIP No. 404119109

	KKR 2006 FUND L.P.
By:	KKR Associates 2006 L.P., general partner
By:	KKR 2006 GP LLC, general partner
By:	/s/ William Janetschek
	Name: William Janetschek Title: Attorney-in-fact for Henry R. Kravis, Managing Member
	KKR ASSOCIATES 2006 L.P.
By:	KKR 2006 GP LLC, general partner
By:	/s/ William Janetschek
	Name: William Janetschek Title: Attorney-in-fact for Henry R. Kravis, Managing Member
	KKR 2006 GP LLC
By:	/s/ William Janetschek
	Name: William Janetschek Title: Attorney-in-fact for Henry R. Kravis, Managing Member
	OPERF CO-INVESTMENT L.L.C.
By:	KKR Associates 2006 L.P., general partner
By:	KKR 2006 GP LLC, general partner
By:	/s/ William Janetschek
	Name: William Janetschek Title: Attorney-in-fact for Henry R. Kravis, Managing Member

CUSIP No. 404119109

	KKR PEI INVESTMENTS, L.P.
By:	KKR PEI Associates L.P., general partner
By:	KKR PEI GP Limited, general partner
By:	/s/ William Janetschek
	Name: William Janetschek Title: Director
	KKR PEI ASSOCIATES L.P.
By:	KKR PEI GP Limited, general partner
By:	/s/ William Janetschek
	Name: William Janetschek Title: Director
	KKR PEI GP LIMITED
By:	/s/ William Janetschek
	Name: William Janetschek Title: Director
	KOHLBERG KRAVIS ROBERTS & CO. L.P.
By:	KKR & Co. L.L.C., general partner
By:	/s/ William Janetschek
	Name: William Janetschek Title: Director

CUSIP No. 404119109

	KKR PARTNERS III, L.P.
By:	KKR III GP L.L.C., general partner
By:	/s/ William Janetschek
	Name: William Janetschek Title: Attorney-in-fact for Henry R. Kravis, Managing Member
	KKR III GP L.L.C.
By:	/s/ William Janetschek
	Name: William Janetschek Title: Attorney-in-fact for Henry R. Kravis, Managing Member
	8 NORTH AMERICA INVESTOR L.P.
By:	KKR Associates 8 NA L.P., general partner
By:	KKR 8 NA Limited, general partner
By:	/s/ William Janetschek
	Name: William Janetschek Title: Director
	KKR ASSOCIATES 8 NA L.P.
By:	KKR 8 NA Limited, general partner
By:	/s/ William Janetschek
	Name: William Janetschek Title: Director
	KKR 8 NA LIMITED
By:	/s/ William Janetschek
	Name: William Janetschek Title: Director