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 June 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:  August 14, 2002         Richard E. Tarrant
                                Chief Executive Officer



                                 /S/ JOHN A. KANE
                                 ---------------------------------------
Dated:  August 14, 2002          John A. Kane
                                 Sr. Vice President, Finance and Administration,
                                 Chief Financial Officer and Treasurer