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 March 31, 2003 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, James H. Crook, Jr., 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.

Dated: May 15, 2003	/s/    JAMES H. CROOK, JR.
	James H. Crook, Jr. Chief Executive Officer

Dated: May 15, 2003	/s/    JOHN A. KANE
	John A. Kane Sr. Vice President, Finance and Administration, Chief Financial Officer and Treasurer

A signed original of this written statement has been provided to IDX Systems Corporation and will be retained by IDX Systems Corporation and furnished to the Securities and Exchange Commission or its staff upon request.