Exhibit 23.3

United States International ------------- ------------- Atlanta Milwaukee Brazil Mexico Boston Minneapolis [AMERICAN APPRAISAL Canada Morocco Buffalo New Orleans ASSOCIATES LOGO] China Philippines Charlotte New York Croatia Portugal Chicago Oak Lawn 411 East Wisconsin Avenue Czech Republic Russia Cincinnati Philadelphia Suite 1900 England Spain Dallas Pittsburgh P.O. Box 664 Germany Taiwan Denver Princeton Milwaukee, Wisconsin 53202-0664 Greece Thailand Detroit Schaumburg Telephone: (414) 271-7240 Hong Kong Turkey Houston St. Louis www.american-appraisal.com Hungary Venezuela Irvine San Italy Jacksonville Francisco Japan Los Angeles Seattle CONSENT OF INDEPENDENT APPRAISER American Appraisal Associates, Inc. ("AAA") hereby consents to the incorporation by reference of its preliminary conclusions of value in Amendment No. 2 to Registration Statement No. 333-104270 of Fiserv, Inc. on Form S-3 ("Form S-3"). Specifically, AAA consents Fiserv's reference to the stated preliminary conclusions of value of $55.9 million for the intangible assets included in the preliminary purchase price allocation for the CNS acquisition, referenced in "Note 2. Acquisitions" of Fiserv's 2002 10K filing, which is incorporated by reference into Fiserv's Form S-3. AMERICAN APPRAISAL ASSOCIATES, INC. By /s/ T. Michael Rathburn --------------------------------- T. Michael Rathburn Associate General Counsel Milwaukee, Wisconsin June 20, 2003