1 EXHIBIT 23(a) INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in this Registration Statement of Cardinal Health, Inc. on Form S-8 filed as Post Effective Amendment No. 1 to Form S-4 Registration Statement No. 333-21631 of our report dated August 13, 1996, appearing in the Annual Report on Form 10-K of Cardinal Health, Inc. for the year ended June 30, 1996. /s/ Deloitte & Touche LLP DELOITTE & TOUCHE LLP Columbus, Ohio March 18, 1997 -9-