Exhibit 23 Independent Auditors' Consent We consent to the incorporation by reference in McKesson Corporation Registration Statements No. 33-86536, 333-611 and 333-2871 on Form S-8 of our report dated June 28, 1996 (November 8, 1996 as to paragraph six of Note Q, which report expresses an unqualified opinion and includes an explanatory paragraph relating to FoxMeyer Corporation's ability to continue as a going concern), with respect to the financial statements of FoxMeyer Corporation as of and for the year ended March 31, 1996 included in this Current Report on Form 8-K/A of McKesson Corporation filed with the Securities and Exchange Commission. Deloitte & Touche LLP Dallas, Texas January 21, 1997