Exhibit 23.1 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-27983, 333-04291, 33-64094, 33-64278, 33-93106) of Express Scripts, Inc. of our report dated February 6, 1998, except for Note 13, which is as of February 20, 1998, appearing on page 25 of this Form 10-K. /s/ Price Waterhouse LLP PRICE WATERHOUSE LLP St. Louis, Missouri March 26, 1998