Exhibit 32.1

Certification of CEO and CFO Pursuant to

18 U.S.C. Section 1350,

as Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report on Form 10-Q of Health Net, Inc. (the “Company”) for the quarterly period ended March 31, 2006 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Jay M. Gellert, as Chief Executive Officer of the Company, and Anthony S. Piszel, as Chief Financial Officer of the Company, each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of their respective knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/    JAY M. GELLERT        

Jay M. Gellert

Chief Executive Officer

May 8, 2006

/s/    ANTHONY S. PISZEL        

Anthony S. Piszel

Chief Financial Officer

May 8, 2006