Exhibit 99.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER
PURSUANT TO 18 U.S.C. SECTION 1350

In connection with the accompanying Quarterly Report on Form 10-Q of Health Management Systems, Inc. for the quarter ended September 30, 2002, I, William F. Miller III, Chairman and Chief Executive Officer of Health Management Systems, Inc., hereby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge and belief, that:

(1) such Quarterly Report on Form 10-Q for the quarter ended September 30, 2002, 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 such Quarterly Report on Form 10-Q for the quarter ended September 30, 2002, fairly presents, in all material respects, the financial condition and results of operations of Health Management Systems, Inc.

By: /s/ William F. Miller III
William F. Miller III
Chairman and Chief Executive Officer
(Principal Executive Officer)

November 14, 2002

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