EXHIBIT 99.1

                CERTIFICATION 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 IDX Systems Corporation
(the "Company") for the period ended September 30, 2002 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), the
undersigned, Richard E. Tarrant, Chief Executive Officer of the Company, and
John A. Kane, Chief Financial Officer of the Company, each hereby certifies,
pursuant to 18 U.S.C. Section 1350, that:

(1)     The Report fully complies with the requirements of Section 13(a) or
        15(d) of the Securities Exchange Act of 1934; 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/ RICHARD E. TARRANT
                                 -----------------------------------------------
Dated:  November 12, 2002        Richard E. Tarrant
                                 Chief Executive Officer





                                  /S/ JOHN A. KANE
                                 -----------------------------------------------
Dated:  November 12, 2002        John A. Kane
                                 Sr. Vice President, Finance and Administration,
                                 Chief Financial Officer and Treasurer